Currently, the Require Category Copy is “You must select a category before typing here”.
See details on Require category selection before writing topic
I suggest adding tips on how to select a category.
Perhaps by including an arrow image like this is enough.
At minimum, I suggest keeping the highlight on the category selection menu if someone clicks on the compose box.
is a lot better than
Finally, I’d love the copy to be friendlier as well. Perhaps having
Select a category before typing here.
is sufficient. I especially like that it’s an action, instead of simply information.