ok you go into settings (via the settings icon on the home screen) and go to the top option that says "Wi-Fi." it should show various networks, and you select yours. if it doesnt show up, you have to type it in manually (via the "Other..." option.). if your network is protected by any type of password (such as WEP), you have to find it and enter it there. after all that, you should be set to go.
hope this helps ;-)