A Master User can also add new users within the company location by
selecting the Add Items button, filling in all required fields
and then clicking on the Save Changes button. You will be
responsible for providing the new user with the User Name (User ID) and
password that you have established. When the new user logs into the
account for the first time with the new user id and password that the HQ
Master User has set up for them; the user is going to be prompted to
change the password when they log into the account.
If a new user has been added, you will see a yellow informational
message. 
The User Information section also allows a
Master User to specify additional Master Users by selecting the HQ
Master User checkbox.