Jenn Air Model 730-0336 , how do I remove the Ignitor to replace it with a new one ? Thanks Ron

Your grill takes "remote" ignitor switch. After removing the screw on cap, there is a screw on washer/nut that you will also unscrew. Then you can push the module inside the cabinet to unhook the wires and replace with the new module. Here is a link to the parts for your grill.
https://grillpartssearch.com/category/Parts_for_JENN-AIR_730-0336_Gas_Grill.html