To edit your own tactics, just select a preset tactic and click on the "Edit" button.
In each case, you can predetermine sequences of actions for your players when they have the ball as well as when they do not. You can use preset tactics or create your own, but the number of orders you can give to your players is limited.
Each order you create is executed according to its position in the list (priority is indicated by the number to the left of each order).
You always follow the same process to create an order:
Action to perform + Trigger Condition = Action
Edit your tactics: