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Caster can be changed with strut in the chassis. I started with max caster and discovered that you can't get much negative camber so I pulled the screws and went with the minumum caster setting, that allowed the max camber. Remove tire, loosen the 4 nuts mounting the strut to the strut tower, long allen screw bit, ball tip even better. Wiggle strut around to get at screws.eng90,
I'm a little late to the party but I'll offer some info to augment the excellent advice already provided by seasoned TMOers.
There are little index marks (for camber) on the top of the plate. They're kind of hard to see but get a good flashlight and you'll see them. Let me state the obvious and tell you to set both sides to the same mark (say, 3rd one from the fender). You can only move the plates if the suspension is not loaded (unless, of course, you eat your Wheaties every day and hit the gym). Check those index marks after you torque the four nuts (do NOT overitighten these - it's only 17 lb-ft per Vorshlag).
The caster can only be changed by removing the allen bolts, moving the plate, and reinstalling the bolts. The strut has to be removed from the car for this change (at least, I can't see how to change the caster from the top of the strut tower).
HTH,
Chris