Basically you sign up for an account and select the type of hashing power that you would like to mine. In this case I selected SHA256 which is predominantly bitcoin mining. You slide the meter over on how much hashing power that you would like to purchase. You then select checkout (like a shopping cart) and purchase the hashpower. This can be done with Bitcoin, credit card, or payoneer. Very simple and exciting.
Then each day you get a bitcoin payout based on how much you have mined.