First, click on your user icon in the navigation bar:
Then choose 'Account Settings':
This takes you to the screen where you can upload your account logo, favicon, and the default featured image:
Account logo
You can change the logo of the account by clicking on the "Upload" button and selecting an image. Allowed extensions are .png, .jpg and .gif. The logo of the account will show in the Manager and will be the fallback image for Open Graph data for Newsrooms and articles.
Favicon
Similarly, you can change the favicon. A favicon is the small icon associated with a website. It usually appears in the browser’s address bar, on tabs, and next to the site name in a user’s bookmarks. You'll need an .ico file for this.
Default Featured Image
Add a default featured image as fallback if there is no featured image added to an article page.
Click the green 'Add' button and select an image from the Asset Manager.
You can also click 'Upload' to select an image from your computer and then choose that image in the Asset Manager.
To remove the selected featured image, click "Delete".
Click the 'Save' button at the bottom of the page once you have completed all changes.
In case there is no default featured image, the logo will be added as fallback to the article.