Follow these, step by step.
1. Download Zynga Texas HoldEm Poker on you Android/iOS device.
2. Login with Facebook or any other type of account. (Guest/Zynga account)
3. Click on the Settings Icon and chose a REDEEM option.
4. Copy the code and paste, or just type it with Qwerty keyboard.
Or on a Computer Login to the Game
1. Settings (Gear symbol top right)
2. Account -> Referrals, Press the green Accept button
3. Select the Redeem tab and enter the code ECHJZSE