What Is A Image URL When I Use A Editor

The editors in Function Tracker are not capable of uploading an image directly into Function Tracker, and they ask for a URL of an existing image that is already on the Internet. For example if you look at this page:

https://functiontracker.com/

There is a logo top left of screen. If you wanted to use this image you would right click on the logo and select "Copy Image Address"  which is:

https://functiontracker.com/wp-content/uploads/2020/10/ftlogo20.png

This URL can then be pasted into in the WYSIWYG editor and It would show the logo.