Redirecting subdomain to a different website
I am having problems trying to figure out how to redirect a subdomain to a different website.
Here's what I want to do:
forum.mydomain.com (hosted by me) -> forum.theirdomain.com (hosted by a different service)
Everytime I setup/edit the 'Subdomain for website' and test it, forum.mydomain.com just directs to mydomain.com
I'm hoping someone could help me set this up. Thanks