Https://fredsappliance.com/service/3-prong-vs-4-prong-dryer-outlets-whats-the-difference/
See above video as a reference.
Note during installation of 4 wire cable the removal of the neutral/frame bonding wire and its relocation (stowed) with the neutral lug. Yours is missing the neutral/frame bond wire but thats ok since it will not be needed for 4 wire.
First things first. You need to get the terminal block put back in its proper location. The 3 wire cable must not have been properly clamped allowing the terminal block to be pulled from its mount. See following pic. Snap it back into place. Replace the cable clamp if failing.
Your 4 wire connections are as follows. I drew as individual wires for clarity only. Your 4 wire cable(sheath) must be inserted and retained by the cable clamp. If cable clamp is not functional you must replace the clamp before continuing.
SOURCE: No heat-switched from 4 prong to 3 prong-Ground????
There should be a ground bonding ******** the Neutral (White) wire at the terminal block for 3-prong configuration. The following link explains:
http://www.fixya.com/support/r793520-3_prong_4_prong_power_cord_conversion
Read through the information, thoroughly. Instructions on how to convert from 4 to 3 prong are mentioned in the "Additional Notes" section. If you have questions, or require addtional assistance please let me know. I hope this helps you.
SOURCE: Connection
the green wire will attach to the dryer cabinet. The white wire will attach to the middle and the other two(red& black) will attach to the outside of the terminal block.
Good Luck!!
SOURCE: Dryer outlet does not have common wire.
The following link explains how to convert from a 3-wire to 4-wire configuration and vice versa:
http://www.fixya.com/support/r793520-3_prong_4_prong_power_cord_conversion
The main difference between these two configurations is how the ground (green or bare copper) and neutral (white) wires are terminated. In a 4-wire confugration, the ground and neutral are independent of each other. In a 3-wire configuration the neutral wire will be grounded at the terminal block in back of the dryer by a ground strap.
Since you have an existing dryer outlet with a 3-prong configuration, the easiest solution would be to replace the dryer cord with a 3-prong cord to match your outlet. No need to rewire your house. A new cord can be purchased at an appliance parts retailer or hardware store for about $20 or less.
If you have questions about this repair, please let me know. I hope this helps you.
SOURCE: I have a new 4 prong plug to replace a old 3 prong on dryer
On a three wire configuration, the ground and the negative are tied together at the center position, using the dryer ground strap. Following is a description of the difference between three and four wire. Hope it helps you.
These two pictures illustrate the power wiring on a the terminal of an electric dryer. The one on top/left is the old-style three-wire configuration. Most people have this type in their homes. New code changes, though, require that dryers now have a four-wire cord, shown on the bottom/right.
Besides the number of wires in each cord, there are two important things to notice. First, in the four-wire configuration, notice that the dryer's grounding strap is folded back on itself. The whole point of the four-wire cord is to separate the ground from the neutral. The green wire (the "new" extra wire in the four-wire cord) is attached to the dryer cabinet. In the three-wire configuration, the grounding strap is left intact and the neutral and ground are tied together.
Sure hope this helps you find a resolution to your delimma! Best wishes. 
SOURCE: I just bought an Amana dryer and need to switch
THE BEST THING TO DO IS CUT THE THE 3 PRONG PLUG OFF WIRE AND REPLACE IT WITH THE 4 PRONG PLUG AND YOU WILL HAVE AN EARTH .
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