If you have your own image logo for your web project, you can use it as a so called favicon (short for favourite icon) for Internet browsers.
Favicon used to be shown in the address bar of your browser, but today it's used for browser tabs and bookmarks. Favicon is shown in all browsers and in the mobile operating systems Android, Windows, and iOS.
You can easily upload a favicon into the administration of your portfolio. Simply click on the Settings folder in your admin and click on System. Here you can upload your image under Favourite website icon. You need to upload it as PNG, optimally with the resolution 310 x 310 pixels (at any case, the image must be a square with visible background).
The image needs to be this large because of the new tiles in the Windows operating system.