We provide you with a special link. If someone coming from that link purchases an annual subscription, we’ll log it and, after the refund period (3 months), we’ll send you $15.
We’re well aware that these types of programs can be abused, so we screen those who sign up for the program. It doesn’t usually take us longer than a few days — we’re just making sure that you’re not a crazy spammer and that you're operating with integrity. We encourage anyone who runs a lit blog to sign up for the program.
We’re happy to have you link to us, even if only one or two people end up purchasing a subscription. So long as you’re sending us real people who are really interested in the service, we’re happy with five or fifty.