After uploading your logo and favicon, your logo and favicon will appear on the top left of the platform, affiliate and advertiser portal.
To upload your company logo and/or your favicon. From the main menu, navigate to Settings -> Settings -> System Settings.
From the System Settings left menu, select Logos
Under the Company Logo Section, select a logo from your computer by clicking on the folder icon 
After choosing a logo, click on the Upload button. Your logo should appear on the top left of the application.
To upload your FavIcon, repeat the above steps under the Company FavIcon Section.
Note: depends on your browser, if the logo does not appear on the top left of platform, go a head and refresh the application.