To sign up, click 'GET FREEBIE' and then fill in your details. When it asks for your postcode, make sure to only type in the first half of it. Once you've verified your email, via the confirmation message sent to your inbox, you'll be all set up!
Then, you will get to help evaluate media and advertising, which in turn will determine future products and aid in measuring the opinion and public view of current topics. Each completed project will give you rewards that are collected into your account.