Every email that RevenueWell sends out has a footer that contains a "Refer a Friend" section. If you don't have an Ongoing Incentive activated, it will simply say, "Help us spread the word! Please take a second to refer your friends & family." If you activate an ongoing incentive, it will replace that text with what you write inside of the referral description.
To include an incentive, click on the Referrals tab.
Then, select a pre-written incentive or create your own. Mark the one you want to feature "Active."
Your emails will then show your text within the "Refer a Friend!" box: