The wireless "switch" on your Toshiba laptop probably is a combination of the Fn key and one of the F keys (there usually will be a "radio antenna" symbol on the F key, which probably is the F8 key). Press the Fn key and you should see an on-screen display of the F key options. Either click the "wireless" icon with your mouse or press the indicated F key (while still holding down the Fn key).
Some Toshiba Satellite laptops ALSO have a switch on the front edge of the laptop.
When the wireless enabled, can you see any "available wireless networks" by clicking the icon in the Taskbar near the clock display?