User blog:Trey810/How do you edit the top sidebar?

I know it probably isn't referred to as the top sidebar, but I don't know the official name for it. Ever since Wiki had its big change in format I've never had to change this top sidebar, which if you don't know what I'm referencing, is the bar where there's the "On The Wiki" option you can scroll over and it'll say "Wiki Activity" and "Random Page". Now, I need to edit it and I've found myself helpless in doing so. How do you edit it? And yes, I am the creator of my Wiki.