Please note that you need to be an Administrator to be able to add a new user.
Step 1
To add a new user go to Settings>Users and the following will be displayed:
Step 2
Select New User and aA pop up box as per image below will be displayed. Enter the details of the new user and select the permissions required. The permissions on the right hand side will highlight to show you permissions allowed. Press Save.
You also have the features to Edit or Delete a user.