You can select which stats you want to track by enabling them in the settings menu on the main page. You can also create two custom stats which you can use for anything you want.
When you tap and drag any player, a menu will appear. You will drag the player to the container that matches the stat you want to track. By dropping them in the shooting area, you will also track that shot location. You will see a confirmation dialog appear in the top right.
The same process can be accomplished by dragging the opponent jersey to track opponent shooting stats.