how does one switch to slow speeds ...

Set the fast speed dial to the slowest speed shown (1/30s I think for the IIIf) and then set the slow speed dial on the front to the speed you want. If you want 1/30s put both dials on 1/30th.
 
Also, the slow speed dial has a little lock thingy to prevent it turning - press that in before you rotate it. It rotates both ways, and doesn't lock at the other speeds (just has a detent), but will try to lock when you rotate it from one side to the other - you can sort of press the lock button with the side of a finger as you rotate.

When using the T setting for time exposure, you close the shutter by rotating the dial a smidge towards B.

When going back to higher speeds, reset the slow dial to its locked position.
 
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