Adding hyperlink to mail?

I've been trying to add a link to my website in my Mail signature but it just see it as text ans shows up with the tags. IS it not possible to add a link in my mail that comes standard with the mac? If so how do I do it?

If you go to Mail>Preferences>Signatures and type what you want in the box it'll be fine...

It doesn't show up as a link in that little box, but if I send an email to myself it's a link. Try emailing yourself to test it.