Your friend simply has to follow your link, sign up and place a cash bet of $20 or more on PointsBet's Sportsbook to unlock theirs and your bonus.
Remember, it is very important that your friend uses the link you provide them to sign up - it is this action that will trigger eligibility for you both.
Casino wagers will not be included in the Refer-A-Friend promotion, so make sure they know to place their first $20 bet on the Sportsbook, not the Casino.