Thread:Project:Support desk/How to prevent publishing any change to a page until approval

Hi! I am using Mediawiki 1.18.1. I want to publish any change to the pages (by users) after my approval. That is if some user do some changes in page(s), that must not be publicly viewed until the ADMIN approves that change. How to do that in media wiki. I am new user so please do give me detailed reply. Thanks