W7 will show the wireless connection in the system tray (default is in lower right corner), put the cursor on it, right-click and select view wireless connections. That will bring up a window to allow you to search or select the connection you want to use. If it is security enabled, you'll have to enter the password.
Open the Connect to the Internet wizard by clicking the Start button Picture of the Start button, and then clicking Control Panel. In the search box, type network, click Network and Sharing Center, click Set up a new connection or network, and then double-click Connect to the Internet.