Feeling Stupid - How do I load the GUI?

[Viridel]

All I need to do is change the name of my processors, and I can't recall at all how to load the GUI to edit this. I've tried all the programs I can see in the GOverlay folder, I've tried the 'Show' option on the small icon... I'm sure I'm just being dumb, but I simply can't remember how to launch the editing interface!