To easily add users from your account, select the letters inside the circle in the upper right on the Home page. The Home page is where you see the list of saved designs in the account. Then select My Team from the drop-down.
To Add a user to the account click the Add User tile. This will open a page asking for the new users email address, and will allow you to assign the teammate to one or multiple locations. This is also where you will confirm billing for the user's in the account. Be sure to click the pink Invite button to send the invitation to the new user.
Once the invite button is selected an email will be sent to the user with an invitation to create their personalized log in for the account. Once the log in is created they will have access to the location(s) that they have been assigned to.