Only users with Admin or Manager status can add or remove users. Admins can manage all users from the Admin tab. Managers can add or remove users they belong to directly from that location’s page.
Go to the Admin Tab
In the Team Members module, select Invite
From there, you can invite one or multiple users, and select their user type. You can also Invite users from a specific location's page, or from the 'Manage' section of the Team Members module.
Go to the Location that you want to invite the user to
Scroll down to ‘Team Members’
Select ‘Invite’ in the top right corner