How to comment under a specific post?

Hey there,

im trying to let the user comment under a specific post. By far my Data base looks like:

But I don’t understand how to set up my workflow for this. I got 2 different pages. One where the user can post something. And one where the comments under the specific post shell be displayed and the user can submit his comment. The comments are displayed in a repeating group. Somehow I need to sort them…

I would be thankful for any help.

Best wishes, Lukas