To access your user presets, you should go to the MIDI/Utility menu of the G-Major, select Program Bank, and set it to "User" instead of "Factory". Now you will be able to recall User presets. Alternatively, you can also use the "External" setting, which will enable you to access both the factory and User presets IF your pedal board sends bank change commands:
(CC#0 value 0=factory bank / CC#0 value 1=user bank)
You can also use the "Custom" setting, which will enable you to access any presets through a custom MIDI Map. To access the MIDI Map, select "Custom" and press Enter (requires software 1.07 or higher).