After we log into our administrative console at rackspacecloud.com, we click on “Hosting”, then “Cloud Sites”, and then the name of the website we want to make changes to, in this case we are working with the domain “chochy.com”.

Next we click on the “Domain” tab, and then click the “Add a Record” button

Now we define a subdomain on our chochy.com domain. In this case, we set up forum.chochy.com. Finally, we enter the location where forum.chochy.com should point from now on. In this case, it is a forum we set up at chochy.vanillaforums.com.

That’s it for the tough stuff. The second step is to purchase one of the paid plans from the “My Account” link on the top-right of your forum’s dashboard.