How to carve within a circle

How do I set the starting point for a round serving tray with 4inch sidewalls. I need to carve an image in the middle of the circle. Help please!

Do you have enough clearance for the machine to operate within the four inch side walls? If you do set the x,y axis at the center of the workpiece. It will do the carve and return to the center when complete. I’m most concerned about the clearance inside the circle. You must consider the diameter of the router. Here’s a video that may help

Thanks. I will try it out and see what happens