You can add using by going to user session from 'setting':-
1) Go to user session and click on 'Add User':
2) Fill up all the information
3) Users receive an email with a temporary password.
4) When user login for first time, Docsumo will ask them to change the password. Once you do that, you are good to go.
1) You can delete user using the delete icon next to edit on the user list.