Is it possible to select part of a picture and fill it in with blank space? If not could someone provide a link to a plugin or workaround?
Rightclick on the layer inside your layers dialogue box and add Alphachannel to that layer (GIMP no longer does this by default; they changed this in of of the 2x releases but don't remember which one. I was angered at first, but many PS filters don't work with alpha channels enabled so I got to like this new feature), then you can just delete that section and it will be transparent. :)
Thank you very much, that solved my problem!