MXR Micro Flanger volume mod

[JRossSmith]

I know a lot of people are familiar with adding a volume control to the MXR Micro Flanger, but I am having issues finding the exact info as to how it's done (aside from a couple of pics that don't tell me much. Does anyone have the schematic and well-written directions on where exactly to solder? I'm not very handy with electronics, so a "for dummies" explanation would be most appreciated. Thanks in advance.