Adjustment layers in PS

This may be a dumb question, but I am a relative newbie with PS7. I've used PSP for it's entire existence, and am just now learning Photoshop7.  I'm wondering, once you do a selective coloring layer, or any adjustment layer, is there any way to go back and edit the settings if you need to tweak it a bit? In PSP, you just edit properties, but that doesn't seem to work with PS. Can anybody point me in the right direction?