Simply join one of the services and give them a valid E-mail address, after a short period of time you will start receiving emails from sponsors. These emails could be informing you of a product, service or website, whatever they are you get paid to read them. The way of returning the information varies between services, some simply require you to click on a link provided in the E-mail, some require you to return a code. You can of course sign up for all of the services we have currently reviewed to maximize your earnings.
All reviews are correct at the time of writing.
Registered trademarks and tradenames are property of their respective owners.