Altering value on webserver.

This function i am calling from loop. Here i can Dispaly all value but i cant change value.

I have attached output of my code. Here i wanted to change latitude, longitude, Let me know how to impliemet using Web app

void Ethernet_Control()
{
  EthernetClient client = server.available();
  // detect if current is the first line
  boolean current_line_is_first = true;

  if (client) {
    // an http request ends with a blank line
    boolean current_line_is_blank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // if we've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so we can send a reply
        if (c == '\n' && current_line_is_blank) {
          // send a standard http response header
          client.println(F("HTTP/1.1 200 OK"));
          client.println(F("Content-Type: text/html"));
          client.println();

          // auto reload webpage every 5 second
          client.println(F("<META HTTP-EQUIV=REFRESH CONTENT=5 URL=>"));

          // webpage title
          client.println(F("<center><p><h5>Web application  V1.0</h5></p><center><hr>
"));
          client.print(F("<p><h5>DATE: = <font color=indigo>"));
          client.print(local_day);
          client.print("/");
          client.print(local_month);
          client.print("/");
          client.print(local_year); 
          client.println("</font></h5></p>");
          client.print(F("<p><h5>TIME: = <font color=indigo>"));
          client.print(local_h);
          client.print(":");
          client.print(local_m);
          client.print(":");
          client.print(local_s);
          client.println("</font></h5></p>");
         // client.print(F("<p><h5>LATITUDE: = <font color=indigo>"));
         // client.print(latitude);
        client.print(" <font> <color=blue> latitude: <input type=text name=01 value=");
        client.println(latitude);
          //client.println("</font></h5></p>");
          //client.print(F("<p><h5>LONGITUDE: = <font color=indigo>"));
            client.print(" <font> <color=black> Longitude: <input type=text name=01 value=");
          client.println(longitude); 
          //client.println("</font></h5></p>");
            client.print(" <font> <color=blue> Desired_Angle: <input type=text name=01 value=");
          //client.print(F("<p><h5>DESIRE_ANGLE: = <font color=indigo>"));
          client.println(tracker_des_angle);
         // client.println("</font></h5></p>");
           client.print(" <font> <color=blue> Actual_Angle: <input type=text name=01 value=");
          //client.print(F("<p><h5>ACTUAL ANGLE: = <font color=indigo>"));                
          client.println(tracker_actual_pos); 
          //client.println("</font></h5></p>");
            //client.print(" <font> <color=blue> Wind_Speed m/s: <input type=text name=01 value=");
             client.println(F("</form>
"));
         client.print(F("<p><h5>WIND_SPEED M/S: = <font color=indigo>"));  
          client.print(Wind_Speed); 
           client.println(F("</form>
"));
          // client.println("</font></h5></p>");
          client.print(F("<p><h5>WIND_SPEED KMPH: = <font color=BLACK>")); 
           //client.println(F("</form>
")); 
            //client.print(" <font> <color=blue> WIND in KMPH: <input type=text name=01 value=");
           client.print(Wind_Kmph); 
             client.println(F("</form>
"));
         //  client.println("</font></h5></p>");
          
          client.println("<form  method=get name=form>");
          client.println(F("<button name=d value=1 type=submit style=height:50px;width:80px>FORWARD</button>"));
          client.println(F("<button name=d value=2 type=submit style=height:50px;width:80px>REVERSE</button>"));
          client.println(F("<button name=d value=3 type=submit style=height:50px;width:80px>STOP</button>"));
          client.println(F("</form>
"));
          
           client.println("<form method=\"get\">");
          ProcessCheckbox(client);
                    client.println("</form>");
                    client.println("</body>");
                    client.println("</html>");


                    //Serial.print(HTTP_req);
                    HTTP_req = "";    // finished with request, empty string

          // button functions
        /*  client.println("<form  method=get name=form>");
          client.println("<button name=b value=1 type=submit style=height:50px;width:80px>LED On</button>");
          client.println("<button name=b value=2 type=submit style=height:50px;width:80px>LED Off</button>");
          client.println("</form>
");
*/
          // webpage footer
        
          client.println("<p>NOTE: This page will automatically refresh every 5 seconds.</p></center>");

          break;
        }
        if (c == '\n') {
          // we're starting a new line
          current_line_is_first = false;
          current_line_is_blank = true;
        } 
        else if (c != '\r') {
          // we've gotten a character on the current line
          current_line_is_blank = false;
        }
        // get the first http request
        if (current_line_is_first && c == '=') {
          for (int i = 0; i < 1; i++) {
            c = client.read();
            command[i] = c;
          }
          
            if (!strcmp(command, "1"))
          {
             client.print("FWD");
             digitalWrite(PWM,1);
            digitalWrite(IN1,1);
            digitalWrite(IN2,0);
            
          }
          
          if (!strcmp(command, "2"))
          {
             client.print("REV");
            digitalWrite(PWM,1);
            digitalWrite(IN1,0);//spdt
            digitalWrite(IN2,1);//dpdt
            
          }
          if (!strcmp(command, "3"))
          {
             client.print("STOP");
            digitalWrite(PWM,0);
            digitalWrite(IN1,0);
            digitalWrite(IN2,0);
            
          }
          
          // LED control
        /*  if (!strcmp(command, "1")) {
            digitalWrite(LED, HIGH);
          }
          else if (!strcmp(command, "2")) {
            digitalWrite(LED, LOW);
          }*/
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    client.stop();
  }
}