how to use wifi

can any one plz tell how to use my wifi device on my laptop

Can you elaborate?
Are you saying your laptop can't see your wireless router or are you talking about a third device?
Or are you talking about public wifi?

Have you read the user manual for your notebook computer?

Have you flipped the wireless switch to the "ON" position and the blue LED with the Wireless icon is glowing?

I would suggest reading the manual first and then moving on from there.

i would hit the function or hot key/switch to enable wifi, then select the network, enter passcode if there is 1, and then your set.