First of: what is a “Favicon”?
It is the icon associated with URL that is variously displayed, as in a browser's address bar or next to the site name in a bookmark list.
How do I add it to my URL?
Log in your platform from here and then select "Desktop Site"
> Click on "Site Template" > Click on "Navigation & Branding" > Scroll to the middle of the page and on point 2 you will see “Upload a Favicon” >Tick this box and upload your favicon. You can use either a 16px X 16px .jpg, .gif or .png image files. Please note that the file cannot be bigger than 4MB.
Once you load your new Favicon, click on SAVE button.
After you save your Favicon, save the settings on the bottom on the page.
Your new Favicon should now be loaded in your white-label site.