if i understood you correctly, in order to play the double-tapped move, you got to move to a certain spots on the court.
as soon as you moved to the spot, the play will start to roll, and you'll got some new options to score as far as the quick-play able to.
to find those "spots" you need to start the play by double-tap the d-pad (as regular) and than press the off-ball button.
then, a circle will show up on the court, and you'll just have to move to the center of it in order to start the play.
i added a picture to make myself more clear:
(as you will(and can) see, some plays asks more than a movement to the circle, they're also want you to move in a certain directions, and some plays are also asking you to pass to certains player after you moved to the circle, those certain players will stand on a yellow star, you'll see what i'm talking about, i'm sure)
by the way, if you're playing on the net, once you tap the off-ball button and the circle is showing up, your opponent will also able to see this circle, so just try to learn the spots orally for a smoove good game.