Nick - You'll have to contact Matt (IH Admin) to have yourself named as moderator.
Not sure how, but as moderator you can add or change the "I Box"...the gray area at the top of the board. I just copied what was on the RB page, and it's incomplete. You can make it as long or as short as you want, add links, post gifs, etc.
Main thing to remember is that as a freebie, you are limited to 18 posts per day. It tells you how many you have remaining at the top of the post box.
When I first registered, I was limited to 3 per day for a while...I guess while they checked me out?