You can invite your friends with the help of the referal link. You will get cash credits for the same. If the person you are referring reaches certain level like gold diamond and platinum, you will get respective cash awards. You can view your cash credits in your profile page.
You can also read the help topics to get more clarity on this. If you need any other assistance you can very well contact me.
Thanks and Regards
Quote: "Don't do to others what you think they don't want to do to you"