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Click the iTunes program icon, which resembles a multicolored musical note on a white background. You'll typically find it in the Mac's Dock. It helps to be connected to the Internet while doing this, since otherwise your songs might not import with the correct information (e.g., artist name, song name, track order). Most Macs don't have built-in CD drives, so you'll most likely need to buy an external one and plug it into your computer. You'll find it in the upper-left side of the window. Doing so will prompt the CD to begin importing into your iTunes library. You can also click No, uncheck any songs you don't want to import, and then click Import CD. Once the import is complete, you can click the blue-and-white "Eject" button in the upper-right side of the page to eject the CD and save your songs.
Open iTunes. Insert the CD into your computer's disk drive. Click the disk icon. Click Yes when prompted. Wait for the songs to finish importing.