Web switch html Log-in

How can i put and where can i put simple log-in for username and password before accessing my web switch?

i am using the code from here. http://www.instructables.com/id/Ethernet-Switching-with-Arduino/

You might read some of the previous post below for possible info.

https://www.google.com/search?ie=UTF-8&oe=UTF-8&q=login&btnG=search&domains=http%3A%2F%2Fforum.arduino.cc&sitesearch=http%3A%2F%2Fforum.arduino.cc&gws_rd=ssl