Problem:

I'm trying to create a form where the registered users can create only one post per user. With the Views plugin I was able to do that but, what should I do to do that using the Blocks plugin?

Solution:

It is the same workflow in Toolset View block, for example:

https://toolset.com/forums/topic/how-should-i-do-to-permit-to-create-only-a-post-for-user-into-a-cpt/#post-2007955

Relevant Documentation:

Problem:

The issue here is that the user's form is not showing to logged out users.

Solution:
The issue here is a permissions issue where the form isn't accessible to guests. To fix this go to Toolset -> Access Control-> Toolset Forms then check to see if your form is here then set it so that Guests can view the form.

Problem: Field groups from the wrong post type are appearing on my form.

Solution: Be sure to set the post types for each field group in the field group editor, then create forms once the field groups are applied.