If you want to for example take a an Analog read and print it on the screen, you can add this code to the bottom of the example (before the close bracket)
// Put this at the top - just about the void setup()
int analogValue;
char analogString[4];
// Put this just before the last closing bracket - just after the nokiaLcd.lcd_clear(BLACK,0,0,131,131);
analogValue = analogRead(0);
itoa(analogValue, analogString, 10);
strcpy(text,analogString);
nokiaLcd.lcd_draw_text(YELLOW, BLACK, 35, 5, text);
delay(2000);
nokiaLcd.lcd_clear(BLACK,0,0,131,131);
Also, please tell me how you connected the display to the Arduino? If you could, please take some pictures of your Arduino and the breadboard!