Need some help if you please. I am attempting to run my first project on Mach 3 and when my router begins to run it slams into my table. (Good thing I have a spoil board) I have narrowed the issue down to the Z axis being programmed in reverse but am unsure how to correct it.
 Help please...

If you have your machine Z axis direction wrongly set then...

Config / Ports & Pins / Motor Outputs - change the 'Dir Low Active' state for your Z axis (cross or tick) then click Apply.

That will change the Z axis direction.

Tweakie.