Im confused as I have 20 postings and Ive been a member for a while now- but it says I have insufficient priviledges to create a thread..
I'll second what @GingerCoffee said. First make sure that you have made 2 constructive critiques on the Workshop, and if it still isn't working send a PM to me or another moderator (by clicking on the mod's name and choosing "Start a conversation") and we'll help you out.