I am having real trouble sharing. I have created an application. I have gone into set up and activated the user and given them permissions. I have then shared the application with the user. The user gets the email, but when I login as the user it says I am logged in, but says " You are not allowed to access this application.  You are not allowed to access this application."

What am I doing wrong?

I am signed up for the free account, and as far as I can see if gives me the ability to share with 3 users, so I can't see that being the issue.