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Do you have a copy of the Spotmatic F manual? It has full instructions for both lens types. Below is a link to a free PDF copy:
Pentax Manuals | M42 Cameras
As for the auto/manual switch on S-M-C/SMC Takumar lenses, there is a strict caution. Never force the switch and never attempt to move it when mounted to your Spotmatic F, ES, or ES II. The same applies off-camera with no rear cap in place. The reason is there is a small interlock pin on the lens flange face intended to enforce auto operation on the Spotmatic F and other bodies supporting open-aperture metering. A full explanation is in the manual available at the linked page above (pages 20-23).
Steve