How do you include an image that is in your own files and does not have an URL?
You can do that just like with regular URL, except you won’t start the absolute path with https://... but with C:/... or wherever the image is located on your hard drive. Or, you can use the relative path, which is even better 
But mind you, only you will be able to see the image if it’s on your computer. If you upload your HTML to, say, CodePen, nobody else will see it. So this only works for testing purposes really 
If you have additional questions, feel free to ask or, as @camperextraordinaire said, tell us what you’ve tried or maybe give us a code sample so that we’ll be able to offer more detailed help