Once a user is added you can assign them to be either an Admin Role or a Read Only Role.

Admins have full access to all data editing and creation.

Read-only users can only perform view operations and can also save reports for themselves.

New users are invited with read-only access. If you need to upgrade them, you can change their roles after they have accepted your invitation.

Scroll to 'Management' and select 'Roles'

This will open the 'Roles' page where you are able to select a role option in the drop-down for each user