If you have had a website banner created for you and would like to upload it to your website please follow these steps:
Log into the Intranet and launch the website editor:
From there select "Advanced Settings":
Next, click on "Display custom header image" and click on "Browse":
Find and select the custom website banner that was created for you then click "Upload". Finally scroll down to the bottom and select "Save Settings" and you're done!
Note: If you load your website and it appears to be loading your older banner, try clearing your browser cache/history and reloading your page.