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From the Main Menuclick on Settings > Sites> Select an Existing site press the symbol
to Edit or Add a New Site 
Select the Images page.
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Add Favicon- it is the image that will be displayed on tabs at the top web browser(Click in the box to upload an image or drag a file to upload).
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Once the image has been added itwill appear in the following section on the site
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Add Logo (Click in the box to upload an image or drag a file to upload).
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