Step 1: Talk to your teenager about his/her actions and why you are having the discussion with him/her.
Step 2: Make sure your teenager understands why his/her actions were wrong and why he/she will be punished for them.
Step 3: Think of an appropriate punishment. The punishment must be resonant enough so that your teenager will remember it and not repeat the same action.
Step 4: Do not allow your teenager to get away without serving the entire punishment.