They pay every 2 weeks. Once you go green you are always green. You go green by completing 1 credit worth of offers. Many offers to choose from. Complete your credit to go green and get a referral to do the same and you have $60.00. 2 referrals is $120 and so on.
Here is where you can sign up...
http://www.rocketbills.com/?referral=994
Here is a look at the offers available...
http://www.rocketbills.com/viewoffers.php