Ishbu, Check this out, I opened the MiG-15 intercept. It was not as straight forward as in 1.2 or 1.5. I hope we find out later why. In mission builder, I navigated to the main DCS 2 folder then Mod/Aircraft/Mig15/missions. That was how I was able to find the mission. I then opened it and made changes. You can then save it to whatever aircraft folder(or my missions) you want. i.e. you could change the MiG-15 into a MiG-29 or fly the F-86 instead. Save, and Done!