Hey, my family just recently bought an Apple iMac, and I'm doing my first PowerPoint on it, this time using Keynote. I'm used to doing these on a PC with Microsoft PowerPoint, and am unsure of what to do on my first slide. This probably sounds like a dumb question, but how do you add background colors to your slides? For my opening slide, I'd like to use craft as my theme, and was hoping for some advice. Thanks.