Try this if you cannot successfully connect to the AT&T Wireless Internet.
INSTRUCTIONS & INFO
From your device, check that you are connected to the AT&T Wireless Internet network. Note: The AT&T Wireless Internet network will display as ATT-WI-[xxxx].
If connected via ethernet, ensure the ethernet cable is firmly attached to both the AT&T Wireless Internet and computer.
Make sure you entered the correct Wi-Fi password. Note: Your Wi-Fi password can be found on the bottom of the AT&T Wireless Internet, if you have not changed it.