Question regarding users and free subscription

Question regarding users and free subscription

Hi all, I am just getting started testing and using Zoho Creator, and have a question. I have a very simple database that I wish to share with my organization - it is simply a database of our members. I wish to have a second person be able to add/modify/delete members; I have added their e-mail address to the Application, and they can see it listed, but cannot modify it or view it. 

They are getting a message saying that they do not have access to that Application, although I have added them to that Application. Does the free subscription not come with 3 users built-in? Or am I misreading that information?

Thank you!

- Albert