1. Download Zynga Texas HoldEm Poker on your Android/iOS device.
2. Login with Facebook or any other type of account. (Guest/Zynga account)
3. Click on the Settings Icon and then select ACCEPT next to "referral".
4. Copy and paste the code, or just type it in. (If you can't type it in, make sure you have played at least 100 hands in order to be able to). Click Submit. Enjoy. :)