The first time you log in to the Zscaler service portal, the End User Subscription Agreement (EUSA) appears.
Click Accept to accept the EUSA. If you click Cancel, the service will allow you to continue. However, not accepting the EUSA leaves your account in an "Agreement Pending" state. You'll be able to configure policies and add users, but the settings won't take an effect and you won't be able to surf the Internet through the Zscaler service until you accept the EUSA.
If you do not accept the EUSA, a reminder appears at the top of the admin portal. It appears every time you log in, until you accept the EUSA.
To access the EUSA if you did not accept it the first time, click the notification. The EUSA will appear and you can accept it. This notification disappears once you accept the EUSA.