Not sure if you mean the in and out part of the cross slide, or the slide to the rail.
The in and out has two allen screws to adjust the brass wedge, also there is a lock down in the center that can be set a little tighter, but I think the best way is the two outer screws to adjust the brass wedge. Adjust equally or you may get out of alignment.
I would mark first so you know where you started, if they need adjustment, you probably are only going to turn them a 32nd of a turn or less.
As to the cross slide, these are instructions.
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