Ok, me and my neighbor share wireless internet, we put a pin and somehow my sister found out the code. My neighbor's asleep right now and I'm pretty pissed off at my sister. Someone please help me!!
The trick would be to change the password by finding out the modem's access ip adress. http://compnetworking.about.com/od/workingwithipaddresses/f/getrouteripaddr.htm
Then change the pin