I think maybe you mean wireless security password ?
Are we here talking about your broadband or your neighbour's?
If that's the reason you can't connect, it's how wireless security works -- so you or your neighbour don't have to unintentionally share broadband with interlopers!
If it's your own wireless broadband (or have your neighbour's permission to use his broadband) you'll need to access the router's setup screens. See literature which came with router or download router manual for how.
Review the router's wireless security password and apply it to your wireless adapter's user setup.