Assuming that you used the Humble widget to purchase the game, here is how to get your account setup:

  1. Go to your Humble store download page (there is link to this page in your initial email)
  2. Hit "Click Here For Your Flippfly Key" (that should take you to the Flippfly website)
  3. Hit the "Redeem" button (that will send you an email with further instructions)