How does the paste monetization feature work?
When you have logged in, you can upload monetized pastes which allows you to earn revenue based on the amount of hits your pastes receive.

I uploaded a monetized paste before the account registration was added to the site. Do I still earn bitcoins?
Yes, your old pastes will continue to receive revenue as normal. All new monetized pastes, however, will need to be uploaded as a registered user in order to use the ad revenue share program.

How is the amount of revenue calculated?
The site shares the ad revenue proportionally based on the amount of hits your pastes get in proportion to all monetized pastes as whole. 

Every 24 hours, the site checks the ad revenue balance that has been received since the last payout. The site then takes a portion of the ad revenue and calculates the amount of bitcoins paid per unpaid hit by dividing the amount of bitcoins with the amount of unpaid hits on the site at the time. 
( Value of unpaid hit = bitcoins to be paid to users / amount of unpaid hits ) 

Your unpaid hits are then converted into paid hits and deposited into your balance. 
( Paid amount of bitcoins = amount of unpaid hits * value of unpaid hit )

You can withdraw your bitcoins once your balance is at least 1 mBT