For a complete breakdown on how to refer others and earn go to the FAQ page; it is #9 under "Making money on HubPages". Here is an excerpt from that section
"Yes, absolutely! You can do so through the HubPages Affiliate Program, which will allow you to earn 10% of the Hub impressions from users you referred to HubPages. It's a great way to share in the success of great writers you might know.
The program works like this: you'll give people you know a specially-encoded link to a page on HubPages. If they click on that link and sign up within 30 days, and before they click on someone else's specially-encoded link, then you'll enjoy 10% of their lifetime impressions automatically. That 10% comes out of our share, not theirs; they will earn 60% of impressions whether they sign up through you or not."
For a more comprehensive description on how to utilize the HP Affiliate Program, go to http://hubpages.com/learningcenter/referral-progra...