In the beginning when starting to earn money from Nerdbux , you have to view the ads that is display in Nerdbux at a daily basis.
In the first 2 weeks, you have to earn your first $0.60, so that you can start renting 3 referrals.
How to start renting Referral ?
Click on "Rent More Referrals" in NerdBux Account
These are the pricing for renting Referrals. (Note : as i am current at my 2nd set of 250 referrals my referral pricing increased by $0.01 for 1 Referrals)
For more information on Referrals pricing :
http://www.nerdbux.com/index.php?view=faq