The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
Follow the steps of a Congalero by repeating sequences using four latin drums. Just make sure you wait until your turn comes up when you hear the chime. If you're confident in your skills, or just want to play around, you can jam the Congas freestyle and find out what beats you can come up with. (Conga Replay features the "Plenas 1-2-3-4-5" song).