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Managing Users in Drupal
Check out the Managing Users in Drupal Video Tutorial:
Managing Users in Drupal Detailed Tutorial
You can manage users' rights from the Drupal Admin section -> People.
Here you can filter the list with the users registered in your system based on the role, defined permissions and status (active, blocked or both).
The Update Options drop-down menu allows the chosen accounts to be blocked, canceled, promoted as administrators or downgraded back to regular users.
Also, you can add a new user or edit a selected one using the corresponding links.