You can use the code below to put a hyperlink in your signature.
He can't because he is a newbie but how he is even wearing a signature? Wasn't newbie restricted to wear signature by theymos some months ago? That's mysterious.
he may have bought copper membership but not wearing it now
cmiiw, he could wear the title, add a signature, then remove the title afterward
if you so eager to know, why not ask/pm the user directly?