Go with "About us" or "Learn more". It should explain in clear, concise way what exactly the service does. I would go with some sort of pictorial flow-chart sor

Go with "About us" or "Learn more". It should explain in clear, concise way what exactly the service does. I would go with some sort of pictorial flow-chart sort of thing..where if I sign-up --> I get <something>. You know what I mean.