If you already have your Kindle set up to "sideload" apps, go to http://account.spacetimestudios.com/download/ choose your game and start downloading.
If you haven't ever "sideloaded" a game or app, here is what you need to do:
- Tap on the "gear" icon found in the upper right hand corner next to the wifi and battery indicator.
- Tap on the More button, which will take you to a list of Settings.
- Scroll down to "Device" and tap on that.
- In the Device settings, configure "Allow Installation of Applications" to On.
- Then you can go back to home and choose to go to the Web.
- Browse to http://account.spacetimestudios.com/download/