You can't change the name of the folder using this app. You CAN find where the app stores its .menu and .desktop files and edit the names of those to change the mane... Not sure off the top of my head where those are stored, though. (As for how, either use a file manager that can get to those files [not the default one]) or use X-Terminal. I would personally use

mv [path of file being renamed]/[name of file] [same path]/[name you want to rename the file to]