First you ask someone to make one for you.
i suck at making them.. otherwise id offer ya one.

anyway you ask someone whos really good at it.. like joanofark or flamepony.

once theyve made one for you,, you click on the "user cp" button.(upper right hand side) and then click on "Edit Profile"
and paste the link in the Signature box.


[IMG ]your siggy link goes here[/IMG ]
its the same steps as above.

oh yeah.. and you have to upload your signature somewhere first.