First of all you need the game "Zynga Poker". If you already have it you can do the following:
If you are on phone or PC follow these steps:
Step 1) Download Zynga Poker
Step 2) Open the app and login with facebook
Step 3) Clik the settings tab
Step 4) Click the redeem button
Step 5) Enter my promo code 97MMPOR
KEEP IN MIND THAT YOU HAVE TO CREATE A NEW ACCOUNT OTHERWISE IT WONT WORK!