After selecting the "Customer Portal" tab in the Settings page, click on the "Edit Header" tab.

In the "Logo" Section of the page, click on the "Browse" button to access your files and folders. Select the image you want to display as your business logo. Please note that the image file should either be a .jpg or .gif with a maximum file size of 1.5 megabytes. To see the image, click on the "Upload" button. To see how your Customer Portal will look, click on the link next to "View your Customer Portal."

Don't forget to click the "Save" button at the bottom of the page to confirm your changes.