How do I go about expressing a complaint with the app? Just post it here on the main news feed?

@preggie_help_android,

Depends on what the complaint is... You can send them a message

thank you @deckroth2001 and @maya.rose

or hit the dots in the top right hand corner and hit complain if its about someone's post.

@nichole_lynn, it isn't about anyone's post, but thank you. I just have a complaint with a particular feature of the app.