New Domain Page Problem

I got a free .tk domain for my forum.
New: simpsonsloversforum.tk
Current: simpsonslovers.forumotion.net

On the .tk domain, I'm sure you can see the problem compared to the forumotion domain.

Yes, it wont work with free domains. Wherever you click on the forum, it will show that free domain name url.

Forumotion domains are like £12 though, where else would I get one?

Forumotion domains are like £12 though, where else would I get one?

May I remind you that double/triple posting isn't tolerated unless separated by 24 hours (Use the edit button)

Godaddy.com