Depending on the gateway you have, finding the wireless page...
1
Locate your 2WIRE pass code that is located on the bottom of the RG. It is near the area on the barcode where your wireless network key is. Write the 10digit pass code down. Then type the following address in the Web browser: 192.168.1.254/mdc.
2
Once in the program, click the System Summary, then select the "Home Network" tab.
3
Navigate to the "Status at a glance" area. Various settings, such as your wireless encryption, key, Network Name and channel appear. The default setting for your wireless channel is located there as well.
If you have the evil 2Wire, it is only a 'g' router, so it is kind of slow.
Sometimes, restarting (unplug/replugin power) the gateway can help....
You can always add a better wifi router to your network. (Google for info)...