When tracking your bets, you can select whether you want each play tracked in units or dollars. If you tend to bet the same amount of money for all of your bets, selecting units may be the right choice for you. If your bets tend to fluctuate in size, you may opt to track your bets in dollars.
To change this, go into your app's settings on the 'My Action' tab.
Once you're in settings, scroll down and select 'Default Bet'.
From there, you're able to change whether you bet in units or dollars. You can also change whether you bet "to risk" (for example, risk 1 unit to win 0.91) or "to win" (risk 1.1 units to win 1).