How Do I Deactivate the Memory Presets from My Ford Key?

1. Press and hold the memory button (located on the driver's door) you want to delete for five seconds. A tone will sound when the memory wipe is complete.
2. Continue to hold the button until you hear a second tone.
3. Within three seconds of the second tone, press the Unlock button on your key fob. 

Additional Topic
How do I link the memory presets to my key?