You can redeem your Rewards Points for Game Credits in the WorldWinner® app by tapping the WW icon at the top of the app:
You'll then be able to select which "bundle" you want: (The Redeem button will be highlighted for the "bundles" that you can afford at this time.)
Game Credits can only be used as your entry fees towards cash tournaments.
In order to redeem Rewards Points, you must "upgrade" your account by making a cash deposit on WorldWinner.
Rewards Points are not redeemable for Cash or other prizes/currencies within the WorldWinner mobile app.