If someone joins HIVE with your referral link, @hiveonboard will send a memo to your HIVE account.
Please take care of the referred user and consider sending a small delegation since your referral won't have many resource credits available at start.

We are recommending that Hive interfaces (dApps) give you, the referrer, a 3% beneficiary reward from the post earnings of your referral. Please be advised that your referrals can always change this setting on their own, since it's totally optional.