The song will be automatically free on your TTR4 app. When you use TTR Tour, use these instructions to get it for free.
Here is the official announcement about the game and free song:
Get “She’s So Mean” for free in @TapTapRevenge from our friends at Best Buy!
Try and keep with the beat and download it at the links below:
— matchboxtwenty (@MatchboxTwenty) November 22, 2012