Remove original images via wp-dashboard, not via ftp.

I have supersmushed my images, and chose to save backups of the original images. Now when I have found the quality of my smushed images good, I want to remove my original images, to decrease the size of the site.
I have found the following answer in your support forum:
"If backup images are the ones you are looking for you can find them in your wp-content/uploads/ folder, each original file will have .bak before file extension, for example it will look like image.bak.jpg"
If I cant use ftp to reach my webhotel, but want to do it from the wp-panel or smushit dashboard, is there a solution?