Using the bet slider:
On a mobile device:Move the chip stack in the betting window up/down (or left/right on a laptop or computer) to increase/decrease your bet amount. Alternatively, you can use the + and – buttons to achieve the same effect. For more aggressive play: ½ pot, full pot, and all-in buttons are also available.
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
Zynga Poker GUIDE