what is an upgrade

If you are not an advanced reviewer on the site, you can send in a request on the community page and other advanced members can read the reviews you have posted (you need at least 2 in order to apply for an upgrade) and decide if they want to vote for you. 5 votes and you are advanced.

Here is a link to what you can do once you are advanced link and here is all of the information on the entire review program link