Share your referral code with friends. You can find it and share it from the Invite Friends screen in the app.
You earn 50 points as soon as a friend signs up with your code, and a further 450 points once that friend completes identity verification (KYC). Your friend earns too: 50 points for signing up with your code, and 250 points when they complete verification.
Because the larger reward is tied to verification rather than signup, a referral only pays out in full once your friend has finished KYC.