my yoyo just spins a drop and falls off the string ??? ??? ??? ??? ??? ???
The trick isn’t as easy as you would think. 
First, you have to triple-check that you’re in the right formation for a flop. Make sure you follow your tutorial to a tee.
Next, typically the strings should be pretty much aligned when you get into the right form. It won’t be flopping yet. Pull with MEDIUM force… firm enough to remove sag and slack from the strings, but that’s all. Pulling too tightly is going to cause problems.
Then you angle one or both hands in the correct direction off-axis. A LITTLE bit. This will cause the flop to start. As it flops, you will need to make adjustments to the direction and amount your hands are off-axis from the yoyo. These are always small, smooth, and subtle adjustments… and honestly, I don’t even know how to describe them, they’ll just make themselves apparent as you mess around and get a feel for the trick.
Hope some of that helps!