For sending support tickets about stuff, you don't need to link your account. You just include a link to you ranch or your player number (specify VHR, VP, VHRII, ect) and what you would like done.
If you do want to link your account to Orbis Worlds, go to
http://virtualhorseranch.com/home.php on said ranch, and click "Link Account to Orbis Worlds!" and follow prompts
