This question should be moved to the help and trainning forum. You go to the mission folder in the Hitech Creations folder on your C drive and delete the mission. I used to keep a standard mission file out there and always load and modify that. Saved a little time, however, I noticed a problem with doing that so I deleted all mission folders and just one off each mission. I would love to see a return of our old mission editor. I felt it was a better tool.