Thread:Dentface/@comment-3281492-20120326211132/@comment-1140008-20120408031915

Ok, go to Special:Preferences, and scroll down to the signature section.

Type in the custom signature box:

Then check the box next to " I want to use wikitext in my signature"

Then scroll to the bottom of the page and click save.

After that, it should be implemented as your signature.