Your current signature doesn't appear to have a link to your userpage or user talk page (message wall), and doesn't even include your username. Keep in mind that the whole point of a signature is to allow other editors to see who wrote what comment and when.
To change your signature, go to Special:Preferences, then scroll down to the "Signature" section. Make sure the "I want to use Wikitext in my signature" box is checked. Then, replace the "Custom Signature" field with the following: