Did you set it up with the wizard to begin with? If you follow that through step by step (Including the focal length of the guider) it should pre-populate most settings reasonably well, including the caibration step size.
If you bring up the manual guide dialog and set a long guide pulse amount (like 1000ms) does the star move in all directions when you hit the manual guide buttons? Just to make sure PHD2 is actually able to move the mount.
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