If u want to use ur existing neighbourhood's WIFI connection, all u gotta do is
if u got laptop : Switch on the wireless, search for wireless connection on windows and get connected.
if u got Desktop PC : buy one a Wireless Network Adapter from Sofitel Complex , Carrefour etc and thats it.
Adapter Price : 95 - 150.

If u want to setup ur own Wireless Connection, U got the answer tallq