Have an old 3 wire 240v range I am installing. I ran a 50amp souple pull circuit with 6/3 wire and installed a 4 prong outlet. How can I convert the range to a four prong plug. Black and Red are easy. Does white go to ground lug on the range and then does green get bonded to the range itself.
Thank you in advance for any information..

Yes, change the cord to a 4 wire. You should see a jumper from the neutral lug on the range terminal strip, remove that. The bare/green shall connect to the metal frame of the range, leaving the white neutral isolated.

Thanks tk!