Editing a page that already exists is very easy. The best way is to browse to the page you need to edit and click on the "Edit" tab at the top. See also "Finding a 'Lost' Page" and "Reverting to an Earlier Page Version".

1. When logged into the website, browse to the page you wish to edit. You will notice a series of tabs across the top: "View," "Edit," and "Revision."
    
2. Click on the "Edit" tab.

   
    

3. Make the necessary changes in the editing area, just as if you're creating a page.
    
4. Click on the "Preview" button to see how the changes will look.
    
5. Click on the "Save" button to finalize the changes.