To edit an existing page, bring the page up on the screen and click the edit tab above. An editable copy of that page will appear below the article. Proceed to make whatever changes you wish. If its a few simple corrections click the This is a minor edit box and briefly describe the nature of your change - spelling, grammar, link repairs, etc. If your changes are significant such as adding a new paragraph, briefly describe the paragraph you added in the Summary box. Click the Show preview button to view your changes. If additional changes need to be made just scroll down to make them. When your changes are complete click Save page and you are done.