How do I limit my users' maximum upload filesize and max logins?

For native users, navigate to 'User Manager' > 'Users' and click on the user you wish to set quotas for. Click on the 'Constraints' tab. Enter the number of max logins in the 'Max Logins' field. Enter the max filesize in bytes in the 'Max Upload Filesize' field and press 'Update' to save.

For AD or LDAP users, navigate to 'User Manager' > 'Groups' and create a new group, or select an existing group.  Click on the 'Constraints' tab. Enter the number of max logins in the 'Max Logins' field. Enter the max filesize in bytes in the 'Max Upload Filesize' field and press 'Update' to save. Then, in 'AD Users' or 'LDAP Users', you can map AD users to the Cerberus group. The Cerberus group quota settings will then apply to those users.