To add or delete a user simply click on the Users menu on the left hand side of the screen. Next, hover over the "File" button with your mouse to bring up the menu to add a new user, or delete the user you have selected.
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When you add a new user it will ask you to create a password for the user after you have done so select "Ok". After you have done so you will be able to add the information you need to the user on the right hand side of your screen. From here you can select whether the user will be an Administrator or User Manager as well as create their Login Name.