Once they receive all advertising revenues for the month. And, they will pass on to you a percentage of the revenues by assigning value per ad point. After the initial delay you will get paid every month. They sells advertising space to advertisers and sponsors and distributes most of the revenues to our members. No, you do not.
Membership is absolutely free.
They will be rewarding you every month by sending you a check. You can do that by pressing on the Request Payment button that will appear in your balance page. Copy link sites below and Join.