Two sided layout

I got the code from here and was actually wanting to post like, my favorite communities in the extra box. My journal is currently set to how I want the layout to be as I tweak it. Is there a way to put your favorite communities there? :/

I was also wanting to know how to put an image in the "About This Journal" free text box. I've seen it done and was curious what I needed to do.

I've tried looking for answers here and haven't found any...

Thanks in advance :3 <3