You’ll need to read a bit more (10 Min, you seem to be at 7 Min atm), enter a number of posts (using search to find related issues like the one you are trying to solve is a good approach) and then a topic creation button will be available once you have trached Basic user status.
Literally, you are only minutes away from being able to create a post.
For more info, try “Discourse trust levels” in the search 
Or jump into Welcome to Bambu Lab Forum - Read Me! - #33 by lkraus