Click a button to add that type of player, then click empty squares to place as many as you want
Click "Give Ball" and a player to give them the ball
Click "Remove Players" and click the players you wish to remove
Click "Move Players" and then drag players where ever you want them
Once you have finished setup click "Finish"

"Clear" wipes the pitch
"Reset" goes back to when you last used the pitch setup
"Replay" replays all the actions you have taken since setup
"Go Back/Forward" undoes or redoes an action