Trying to engrave something, trouble setting up my offsets.

I generated G-code to engrave the outline of a chess piece into a piece of plastic. My machines work envelope is 16 by 12 by 5, and the rectangular prism shows up on my Linuxcnc screen. When I upload my G code, the engraving tool wants to start the cutting at the very corner of my work envelope! Not at the location of my vise. How do I move it so the work starts where my vise is? Also, I had an error with the tool table so I had to delete a line of code.

Hey just figured it out, use the Touch off button, and for coordinate relative to workpiece, enter 0. Do this for X Y and Z.