how to use the KERN VARIO-SWITAR 1:1,9 f16-100mmPOE BOLEX H16 RX lens

[Giovanni Savino]

I need to use this lens on a Bolex REX 5 but there are a couple of things I am unsure about:

there is a small push button to run the camera from the lens body right below the screw-in hole to attach the "remote" start stop cable.

This push button can be swung to the left and to the right against two small symbols ( two circles, one with a small black dot and the other with a big black dot in it) and appears to affect the built in metering.

All info about how to use this properly would be greately apreciated.