Go into your browser and type one of the following addresses; 192.168.2.1 or 192.168.0.1. Press Enter and you should be greeted with the router setup page login. The username should be 'admin' and the password blank; if it isn't, Google the default settings for your model of router. You should now be able to use the settings inside the router to set a proper internet password. Change all of the connected devices in your home to match these settings and you'll be good to go. If you can, try to set the encryption type to WPA2, or WPA (on the router, then on each individual device), as they're the most secure and the least retarded.
If you have any more questions, shoot me a PM, or try Googling the model number for assistance. It's bogus how they want you to pay that much for help with your connection, I normally just ring my phone company and they help me for nothing if I'm having issues. Best of luck.