How to Upload a Custom Header Image
Step 1: Create a custom header image sized at: 740×120 pixels and save the image as a .jpg or .gif file.
Step 2: From the Wordpress dashboard click “Manage > Pages …” and click the title of the page you want to add a custom header image to.
Step 3: Using the Wordpress image uploader, upload the header image you want to use
Step 4: Copy the link URL of the image you just uploaded (on a Windows computer, highlight the URL and press Ctrl + C)
Step 5: In the “Advanced Options” section at the bottom of the page, click the drop down arrow next to “Custom Fields”. In the “Key” field type “headerimage” (without the quotes of course), in the “Value” field paste the URL you copied earlier. Then click “Add Custom Field”.
Step 6: After you add your custom field click the “Save” button.
