Create A Forum - Support Forums

Hi.
I just created a forum and i'm testing if i can get everything working before migrating here.
I want to use my subdomain instead of createaforum.com subdomain.That is: forum2.simulide.com instead of simulide.createaforum.com

I created a CNAME record:  forum2.simulide.com  =>  createaforum.comThen in admin panel->domain parking manager, i added: forum2.simulide.com
Now i can access my forum here: https://forum2.simulide.com/  but firefox throws a security alert...When i try to go to any board it redirects to: http://www.forum2.simulide.com/board_name/ and i get a white screen.
Now i can't even login to delete the domain parking.
What can i do to solve this issue?

Thanks for the fast reply.
But it is not working.
If i go to http://forum2.simulide.com it get redirected to https://forum2.simulide.com/ but with security alert.If i try to login i get an error msg:   An Error Has Occurred!     Your session timed out while posting.  Please go back and try again.
This is the cname entry, is it ok?.   
Then.. it is not possible to use https with donain parking?
Edited: i found that https requires the corresponding upgrade.