The Index has two referral programs: refer authors and refer visitors.
Choose to participate in one or both programs.
To make commissions from referring other authors, the authors you refer must pay to join the Index. You get to choose how much you want to charge with some limits. To learn more about the author referral program, read the information here.
To make commissions from referring visitors you aren’t required to do anything but get new visitors to come to view the Index. This program doesn’t require you to get visitors to sign up for anything or even register for the site. They just have to click and look around. To learn more about the visitors referral program, read the information here.