To fix a broken rear cup holder in your Ford F150, follow these simple steps: 1. Start by removing any items from the cup holder and pulling it out completely. 2. Inspect the holder for any visible damage or loose components. 3. If there are any broken parts, you can order replacements from a Ford dealership or online. 4. Once you have the replacement parts, insert them into the cup holder and ensure they fit securely. 5. Reinstall the cup holder back into its original position. 6. Test the cup holder by placing a cup in it to ensure it is fixed properly.