To start rounding up and investing your spare change into Donut, follow these 3 steps:
Scroll to the bottom of your home screen and select “Round-up"
Tap “Round-up Accounts” to add a credit card, debit card and/or bank account
Press the play button on your Round-up ring to start earning every time you spend
To round up spare change faster you can activate multiple cards and payment methods for Round-up, or increase your multiplier to 2x, 5x, or 10x.