Only super users with access to control panel can add users
To add a new user navigate to the control panel. You can click on the three dots in a column and then click on the Control Panel.
Next click on users on the side menu.
This will take you to a list of active users. To register a new user click the plus sign in the top right.
This will bring up the registrations form. Complete all the boxes and select access levels for your new users.