Edit: solved!
All of the reply buttons are there for comments, but nothing for the actual post itself. Here's a screenshot:
this post was submitted on 20 Aug 2023
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You should have a floating action button on the bottom right of the screen 
Oh, duh! Thanks, lol.
Or, you can do the bottom navigation which would look like this: 
(I think that's going to look right, but no image in my preview yet)