Once you get approved you they will send you interesting assignments with a link and anchor text. What you need to do is find a way to integrate the link to your post you don't have to review or write about the product or services. You may receive assignment daily or twice a week it depends on the popularity of your blog among advertisers. Your post must have a minimum of 60 words and you can earn up to $5 per post. You may also receive product review assignments.
PayU2Blog is a good source of extra income that you can generate from your blogs.