Add Comments in the drop down menu

I'm using a snapshot of gallery2 from late June, and wpg2 plug-in to integrate the gallery into my wordpress site. In order for this to work well, and look good, I am using a wordpress layout and theme, which gets rid of the sidebar on the left. Unfortunately this makes it impossible for guests to add comments to the photos. I would like to put the "add comments" back in the drop down menu below the images. Could anyone tell me how to do this?

Thanks