You probably shouldn't, its against the rules to advertise your website... I think in your sig is okay... I've seen a few people do it... Just don't go crazy putting it as your avatar or something like that... One user got banned for doing it everywhere....
There is a link there to the rule about No Personal Websites or Links (except in signature messages).
If you have other questions about our rules and cannot find the information in our Users Guide to TamaTalk forum area or our Site Rules, please feel free to send me a PM and ask