They will put the tips on your account automatically unless you tell them at the pursers desk that you do not want automatic tipping. You can also get envelopes to give out personal tips. On the Dawn Princess you could also go to the bars and put whatever tip you wanted on your bill and you could state who you wanted the tip to go to. Your receipt would have the name of the person you wanted it to go to on it. You than could put the receipt in an envelope and give it to that person. They would than turn it in to get their money. The last full day they also set up this option at a specific table in one of the dining rooms if you did not want to do it through the bar.