I forgot my wireless password.

Do you know the IP address of your access point?
If so you should be able to access the interface of the access point by typing it's IP address in a web browser. However, that will also be password protected as well. If you have never changed this password from the default one you should be able to Google the make and model of your AP and get the default username and password. Once you get in to the AP it should be pretty simple to reset your WiFi password. If that doesn't work you may be able to perform a hard reset of the AP by holding down the manual reset button for 5 seconds or more (that works on most brands, but not all).

What router?

Read all through, see if this may help
http://netsecurity.about.com/od/secureyourwifinetwork/a/How-To-Change-Your-Wireless-Routers-Admin-Password.htm