Playing the files from your Apple device is a two step process. First you need to download the files to your computer then you need to add them to iTunes and sync them to your device.
Here's how to access your downloads on your computer:
1. Go to www.ransomedheart.com, click on the "Login" link at the top of the page (or the "My Account" link if you're already logged in)
2. After you're logged in from the "My Account" section click on "My Downloads"
3. You should see a list of all your available downloads to download the files, right click on the file name and choose "save as."
Once you've downloaded the files to your computer you can follow the directions from Apple's website to import them into iTunes: http://support.apple.com/kb/HT1473