nice job! i tried to go on a retro and all the hrefs were site.com and not www.site.com and it was really annoying keep having to put the www. in so sites lie them should use them! liked
Why are you using HoloCMS? Are you planning on securing it? It does have tons of exploits and if you make it public you WILL get hacked.
ON TOPIC: Is there any errors on the page after trying to register? Maybe the href is linked back to the register? Just some thoughts.
CookieMS is a scratch development, it's design is to look exactly like HABBO not some frost crap. Also as far as I'm aware frost is exploited, is CookieMS? No. Also I know it's scratch because I've seen some of the code.
Plus does frost allow you to make to make themes? If it does CookieMS...