No permission to the form 
I don’t mean to **** on your chips, but personally, I don’t see the point in the changes so far… There’s a prettier landing page to the topics, but you end up on the Discourse area anyway. I changed my bookmarks to point me directly at the Discourse subdomain to remove this step you introduced. I like landing straight at the ‘Latest’ view of the lot personally.
Let me know when you’ve sorted the form access and I’ll answer the specific questions you have 