If you're still interested, please continue below.
First of all, you need to have an Electronic Bank from which you will be transferring your earnings to and from, note that having the money in your Electronic Bank, does not necessarily mean the money is completely yours yet. Click here for detailed information.
If you face any problems feel free to ask for help anytime.
Let's play a bit with Math. :P
You can earn even more than $90 a month, and with only 10 referrals each site. I, for one, got 50 referrals on each site. You do the math. ^_~
Renew: If you like your referrals and find that they are doing good job you can renew the contract to keep them for an extended time. (You have to extend them either way. and then recycle if you desire.)