Oven wiring 4 wire to 3 wire oven diagram

[ohill]

I know this has probably been asked too may times already but, I am installing a 4 wire oven into 3 wire receptacle and need to change the wires inside the oven. I have a diagram but don't see how to add pictures on here. anyway, just wanting to connect the neutral and ground at the circuit board inside the oven. There is a pin on the board where the green ground wire is connected and grounds to the enclosure. A few pins over there is an unused pin right next to the pins where all of the white wires connect and I am guessing this is where I need to move the green wire to to bond the ground and neutral. But, electricity is not my first choice of things to guess at. The unused pin has NB next to it and a wave like symbol going from it over to the pin where the white wires are connected. I am guessing again that this means these pins are internally strapped/bonded?
I wish I could just load a picture here of the diagram, but don't see how so.... if anybody has any idea what I am asking please let me know.
thanks

[JP]

The 3 wire receptacle for the oven no longer meets code, and really should be changed to the proper 4 wire circuit. I guess you can rig it, but if it was me I would totally change the circuit to a 4 wire so that it meets code.