I own one. What do you need to know?
You've got one knob on the bottom right side (presuming you are holding the camera and looking down the chimney finder) for setting the spring tension. Turning the knob increases tension, and pushing the button underneath releases tension.
The top right knob advances the curtain from smaller to larger slit widths, with a lever that releases the curtain to move from larger to smaller slit widths. Use the table to find the slit/tension combination for the shutter speed you want.
The aperture is uncoupled, so you just set it on the lens. Focus is focus. There's a lever on the right side to lower the the mirror to focus with the chimney finder. The button on the left releases the mirror (if it's down) and the shutter curtain to make an exposure.
To remove the groundglass panel release the slider on the bottom and slide the panel down. Then you can attach film or plate magazines that clip into place with a mechanism that is unique to the Press Graflex. You can also use 5x7" Graflex-type filmholders under the spring back.
When you close the camera, lower the front flap before retracting the focus all the way, and if the tab at the bottom isn't bent, a pin will rise to hold the lens cover in place.
That's most of basic operation.
If you have a film or plate magazine (bag mag), I can offer a few tips about those as well, if you are unfamiliar with bag mags.
Catalogue page attached.
