User blog:Kkoria/Sandbox Help?

I feel a tad stupid  for having to ask this question, but I was curious as to how I could edit things in this "sandbox" everyone talks about...

I've seen it before, but it was be fore a lot o f changes were made to the Wiki. Now I'm not sure how to access it, let alone use it.

And I would appreciate it i f I wasn't redirected to another page, but i f someone could just tell me how to access it. I f you tell me that then I'm sure I can  figure out the rest. That's how I  figure out just about everything else. :)