Let's say you're about to give a presentation and you want to print slides for your audience. Well, you probably want to customize your lay out so you don't waste ink, toner or paper. With Keynote, that's really easy to do. With your presentation open, go to File, the Print, and with the third dropdown menu, select Keynote. Here, you can customize your layout easily. For more, as well as step-by-step instructions for customizing print settings in Keynote, watch this video tutorial.