There are no rules saying you cannot, but I would consider all the pros and cons of doing so. First, there is no dedicated Writing section in these forums. I believe some members use their blogs as a platform, so that is an option for you.
Second, if you are posting your original IPs, consider the fact that you risk your ideas being stolen. I do not think, and I hope, that there are no literary thieves here, but you never know if unregistered passers by might steal something. SJWs are talentless hacks, and we know they are lurking watching these forums. They are not beyond stealing.
Third, if you get to know people here and find you have confidence in their integrity, you could probably recruit pre-readers to help you in whatever fashion you need.
Personally, I will not be posting my original IPs here, though I will likely in the future discuss and promote them, via these forums and a YT channel, should my next attempts at finding an agent fail. As talked about above, I believe that a legitimate path forward for new authors being Gate Kept from the industry lies in like minded people that appear to be gathering here to use the Comicsgate model of promotion and self publishing via Indie Go Go to get our work out there.