Having author names instead of usernames

I have looked over all other forums on this topic but I cant seem to figure out what to do. I need to change my bylines so instead of a username it just appears as a name, like Bob Smith instead of bsmith12 or something. I found where to change it in my coding of node.tpl.php where it says:

print t('!date — !username', array('!username' => theme('username', $node), '!date' => format_date($node->created)));

But I don't know what to change it to to make it the way I want it. Can someone help out and tell me what to change the code to?

Thanks