You can set the title, logo and description of your apps from the Gear Menu by selecting “Titles and Logos…”.
You will then see a dialog that allows you to change the metadata for your app. The title, logo and description will be displayed when sharing your app on social media. The title is also displayed on the browser tab, and the logo is used for the favicon (the icon that appears in your browser tab). You may need to clear your browser cache to see your new favicon.