On my laptop the wireless is controlled by Function (Fn Key) together with F2 on the very top row. The F2 key has a radio aerial symbol on it. There is no single wireless key - I need to depress Fn & F2 together. Your keys may be different.
Alternatively...
http://www.howtomendit.com/answers.php?id=253339
Your laptop does not connect to the internet - the wireless router manages that - you need to make a local area connection between your laptop and the router...
Good luck...
Peccavi
June 2009