To add users, go to the Users page by clicking on your name which will expand the drop-down menu containing the Users page link. Click on it to open the page.
Through the Users page, you can view and invite your team members. You will get to pick the role: Administrator, Manager, or Contributor. To find out more about what the various roles entail, click here.
*** A Contributor cannot invite other team members and must be a Manager or Administrator to invite other users.
*** A new user invitation will expire after 14 days. After 14 days you will need to resend the invite if the user has not authenticated their account.