This can be a signature of plain text but you can also add an image. To do so, follow these steps:
Upload your image to a place on the Internet that everyone can access. In the example below, this is the website https://www.tuxis.nl/ We have placed the image in the "img" folder. That way we know for sure that everyone can access it. Please use a website that uses https://.
Click on the button with the arrow to display the HTML source code.