Prepare the masa according to my recipe instructions. Make sure you grab a spoon or spatula and run it through the masa and move it through the top of the dough, it should spread smoothly like the way frosting does.
Grab a small dollop, about 1 teaspoons or so, and drop it into a small cup of warm water.
If the masa is ready it will float right back up to the top within a second or so.