First, product vendors contact Blogitive and let them know of a new product or service that they would like bloggers to review or mention.  Then, you accept their offer and write about or mention their product on your blog.  Go back and paste a link to your blog post in the appropriate form at Blogitive.  Blogitive will review your post, then you get paid through Paypal.  Most offers are for $5 a post.  You can accept as many offers as you want.