Users creating their own account and login

Users creating their own account and login

I am trying to build an app for about 1500 users. I start with a private stateless form embedded in a website. Because the form is private the user is prompted to enter their account info (Zoho, Google, Yahoo or Facebook). See the first screen shot below.

For the first time user I then want to use the share statement to share the appropriate sections of the application. But I don't know where to place the share statement. All that happens now is a message saying the user does not have access to the application. See the second screen shot below.

There seems to be many threads in the forum asking for easier ways to have people signup for applications. Now that there are subscriptions with unlimited users addressing the signup issue needs to be done.