Create A Forum - Support Forums

I have signed up for a forum at CreateAforum since 2013 but never bought the ultimate plan until late July. Now, the problem is that ever since I've bought the ultimate plan, some of the promised features were not added. In fact the needed and important features are not working on my forum. I can only have access to features like store, classifieds and chat. I installed ad seller pro but it doesn't display my ads or show any ads location even after I enabled all the ads location. I needed the download modification which is rightly on my admin portal but wasn't able to view and install it because it's not working...

Now, the most annoying to say is that i bought a domain name from godaddy the same day I paid for the ultimate plan but after watching Tutorials and setting up and changing the nameservers to the specific host nameservers given by CreateAforum...

All i have been seeing is that I have an error in the set up when ever I tried to update the url from my forum admin and godaddy is telling there was a wrong use of nameservers or the nameservers address is not registered

Pls is there a way out for me or I should forget about the site because am fed up right now... Please kindly help me out! My forum address is nounforum.createaforum.com and my registered domain name is schoodu.com

Thank You.