It's unclear how to make the first post in the forum
This is a bit confusing an potentially leads to a bad first experience for new users:
Central problem: Where do I post?
Neither of the buttons is an obvious choice. Maybe the second button could read "Post (needs review by moderator)" or similar? Alternatively do what other forums do and inform the user after clicking "Post" that the post will first go through moderation and will not be immediately visible.
Potentially destructive and annoying behavior:
When being a good user and clicking "Please read Inkscape's Code of Conduct before posting." the CoC opens in the same page. After going back to the forum any message content typed before is lost.
The CoC should open in a new page instead, to avoid any disruption.