I'm assuming you mean how you focus with it on the E-P1?
The E-P1 uses a live view mode, so essentially just set to whatever aperture you want on your lens, then turn the focus dial on the lens while viewing the LCD. To assist you there's a zoom in function which can allow you to fine tune the focus. You just make sure the camera is in the "manual focus zoom mode" (forgot the actual name), hit OK on the camera dial, and it zooms into the area you selected. Hit OK again after you got your focus and then you can recompose the shot.
The zoom goes in 7x or 10x, which can get very bumpy when shooting at anything above 40mm.
The images look great! The image will zoom for fine focusing even though you were using your Voigtlander lenses? I'm planning on getting a Nikon F Mount to M4/3 adapter for my E-P1 and kinda wondering how to focus if it does not zoom.