There's a problem in the editor that prevents you from using a System / Preset action to access the global preset. Until I can fix that, the only way to do it is the following:
1). In the PBC's setup menu, select Function Switch and set it to Global Preset
2). Then, read the PBC's current settings into the editor
3). Copy the Function switch on page 1 and paste it where you want the Global Preset button to be
4). Now you can return the Function switch settings on page 1 to whatever they used to be