To spin the Bonus Wheel, tap on the icon in the upper right corner of the screen and then press the Spin button. After watching a short 5-10 second ad, you’ll earn one of eight available rewards that are displayed on the wheel.
For every 10 spins you make, you’ll earn a milestone reward, which you can track using the progress bar.
Keep in mind that there’s a limit of 20 spins per day, and the clock resets every day at midnight. That means you can watch up to 20 ads each day to earn rewards.