They're talking about becoming an advanced reviewer. You can do this one of two ways - going before the community for a vote once you've written more than 2 reviews....or...going through the mentor program. You write a minimum of 2 reviews with your mentor and once they graduate you - you're an advanced reviewer and then able to request "free stuff".
The mentor program is here
along with a list of available mentors.
You can find out more about the benefits of being an advanced reviewer here