While driving transmission warning light turned on then car would not Move

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The first thing that really should be done is to check for diagnostic trouble codes. This will point us in the right direction for the correct repair. Here is a quick video showing how to use a scanner:

https://youtu.be/YV3TRZwer8k

I realize most people don't own a scanner, but often times a parts store will lend or rent one to you. This should be done first to eliminate a misdiagnosis. Honestly, many things could be happening here and without the codes, it becomes a guessing game.

The only simple thing you can do is check to make sure the transmission fluid is clean and full. And I have to say that isn't even simple anymore. Here are the directions if you want to check fluid level. The attached pics correlate with the directions.

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2012 Ford Focus L4-2.0L
Transmission Fluid Level Check
Vehicle Maintenance Fluids Fluid - ASMT Service and Repair Procedures Transmission Fluid Level Check
TRANSMISSION FLUID LEVEL CHECK
Transmission Fluid Level Check

Special Tool(s)/ General Equipment

pic 1

Materials

pic 2

Check

1. Refer to: Jacking and Lifting - Overview See: Vehicle Lifting > Procedures > Jacking and Lifting (100-02 Jacking and Lifting, Description and Operation).

Refer to: Engine Undershield See: Access Cover, Engine > Removal and Replacement > Engine Undershield (501-02 Front End Body Panels, Removal and Installation).

2. Use the General Equipment: Ball End Hex Bit

pic 3

3. NOTE: Do not overfill the transmission. This causes transmission fluid to be forced out of the case.

Add transmission fluid until the oil runs out of the fill port in a continuous stream. The transmission is full when the oil flow from the fill port has slowed to a broken stream or dripping.
Use the General Equipment: Fluid Suction Gun
Material : Motorcraft(R) Dual Clutch Transmission Fluid / XT-11-QDC (WSS-M2C200-D2)

pic 4

4. NOTE: The O-ring seal is to be reused unless damaged.

Use the General Equipment: Ball End Hex Bit
Torque : 32 lb.ft (43 Nm)

pic 5

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Let me know what you find or if you have other questions.

Take care,
Joe

All of your symptoms lead to a faulty transmission control unit. I've replaced hundreds of them, but the first step is still to retrieve the trouble codes from the power-train control module (PCM).