I know it's mentioned in a few places but this is the only one I can find right now:
You are welcome to link to your personal blog from your signature. If you do so, please return the favor by linking to our parent site, http://www.tropicalfishkeeping.com. If you do, notify a moderator and you will receive a linking member designation for supporting the community.
Basically if you have a website or blog link to the parent site on it and send the link of your website to a Mod so they can check it out.