Upload a Masthead Image
Step 1: Create the file. For consistency crop it to 190 pixels (px) tall and 440px wide.Make sure your final version is smaller than 75KB.
Step 2: Save the file as a JPG. For it to work, you MUST name the photo file with the format of areaname.jpg. The areaname is the section of the website on which this masthead photo will be visible. See a list of area names if you're not sure what it is. For example, The area name of the articles section is "articles", so it's masthead photo should be named "articles.jpg".
Step 3: Click the "Browse" button, find your photo file, and click "Upload" Photo