This article goes over how to access Unite Manager.
INSTRUCTIONS & INFO
To open the AT&T Wi-Fi Manager, first connect a device to your hotspot's Wi-Fi network.
From the connected device, open the web browser.
Enter 'http://attwifimanager/' in the Web address bar, then press Enter.
Enter the required password as displayed under Wi-Fi Passwords of your Quick Start Guide, then click Sign In. Note: The default password to access the AT&T Wi-Fi Manager is "attadmin"