Hello, I wanted to know when converting to a 4 prong dryer cord , what do you do with the green ground wire that is already connected to the frame. Do I replace it with the green ground wire that's on the cord or do I leave it alone, and place the green wire from the cord on another screw.

Connect the green wire from the cord to the frame also. Leave the green wire there alone.

Color Match The Wires, Red To Red, Black To Black, White To White, Green To Green. Actually You Are Just Having A Neutral And A Ground, Which Is Probably Going To Be Hooked To The Same Buss Bar In The Panel Box Unless It Is A New Construction Or Has Been Done In About The Last 10 To 15 Years.

The pictures on this page show you how to do the job...
The top picture is the terminal board with 3 wires- 3prong

The main thing is the metal strap is removed from the center post ---
Which is now the (N) neutral in the 4 wire - 4 prong (second picture)

Appliantology Archive: Dryer Cords (http://fixitnow.com/appliantology/dryercords.htm)

In the bottom picture you can see ( L2 where BLACK wire is connected )
(N is neutral where WHITE wire is connected ) ( L1 where RED wire is connected )
( Green is GROUND and connects to the case of the dryer )

If I were doing this change I would remove strap and put ground
( GREEN wire ) where strap is shown sticking out - much better

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