When someone post a post you see the star sign below the username and wne you click on it you have the ability to choose a approve or disapporve button. You can write a reason why you like/dislike a post. We had troubles wiht people misabusing the rep ability and they derepped people for teh most weirdest and silliest reasons. We had a topic wheter or not to keep the system.
Your sig is showing up. (Click the About Me tab on your page). You didn't have a signature before, so it didn't show up on your old posts. If you make a post now, it'll show up. You put it in correctly. Looks good on you.