pls i use Nokia n81 and it wlan feature (wireless) Wich normally get service around but i dont know how to use it to browse.pls i need someone to explain how it can be used.

This is all from my head, so excuse me if I miss something.

You should be able to open the Mobile browser, view options and select "change connection", (it could be change, new, switch, whatever). From there you should be able to select WiFi or WLan, and connect to the network. Another way could be to setup a wireless profile first, you should be able to do this from the Settings menu, around "Connections". Just try to browse through the phone, it's probably very easy.