Change your custom URL in the Box from AT&T admin console

1.       From the home screen, click Admin Console in the column on the left of the page.

2.       Click the gear icon  at the top right.

3.       Click Business Settings in the drop-down menu.

Note: Enterprise accounts display “Enterprise Settings” instead of “Business Settings”.

4.       Click the Custom Setup link.

5.       Click the field under “Custom Subdomain”, and enter your custom URL.

6.       Scroll down, and click the Save button.