The Flap Tap step is from the Tap dance complete beginner course. This is just one of the moves covered there.
This step is From:
Tap dance course for beginners
Learn how to tap dance step by step with 12 HD videos running for over 14 hours! You will learn 34 different steps and 14 combinations. All broken down easily with professional instruction. You can watch the lessons online or download them to your computer.
Tap dance video course for beginners (Click here)