I found that a lot of these instructions on how to do this were too complicated so I am making this to help people who had similar issues.
first upload Arduino ISP sketch from examples onto a working Mega 2650
Once upload complete disconnect of computer and connect as shown below.
then connect the Mega 2650 you are using as programmer to USB and go to tools
verify proper com port and processor
then burn Bootloader
and you are done the Mega 2650 you just replaced bootloader onto should now be running Blink Sketch and be able to upload your Sketches to it.
I hope this helps