There are 2 sections in the RP100. Presets 1-40 are User and 41-80 are Factory. The only locations that can be stored to are the User presets. If you make a modification to any preset, then want to make those changes permanent, you MUST store the preset to a User location (1-40). When you are finished making your changes, press store once. If you are on a Factory preset, the display will change to a user location (1-40). Choose one of the User locations with the footswitches (1-40) and press store again.