You can invite as many Users as you like. There are a fixed number of slots included in the price of your plan, as below:
The STARTER plan only includes one user (you!) but you can still purchase additional team member slots as outlined below.
With the PRO plan, you can invite 1 additional user.
With the ADVANCED plan, you can invite 2 additional users.
If you would like to add more users to your team after using up your available slots, you can purchase additional team member slots here.
(Admins and Managers can both invite more users, but only the Admin can purchase the slots.)