The idea of pinching is to force energy from growing into developing and ripening fruit.
After 5 to 7 leaves, pinch the tip. If at any point you see further branching, pinch those tips off as well. I rarely do this step as I like to develop the branches and skeleton first. I concentrate more on the secondary step.
Secondary step: On trees 3 years or younger, I leave only 3 to 5 fruits per branch and pinch off any other figs developing, especially those that develop after July 15th. Here in MA the chances of anything developing after Oct. 1st are slim.
Pinching is a great tool in the spring when trees come out of dormancy. Say you have a 5 ft tree with no branching, pinch the tip and the tree will produce branches. With branches come fruit and then pinch those at the ends.
Pinching helps all stages of a tree.