I can't get more "layman" than this...
You need a very basic understanding of HTML if you want to manage your content in the way you are proposing. The <img src="images/abcde.jpg"> is very basic html...
Try putting this in to the input field for the "Insert Image" feature:
images/abcde.jpg
... and make sure the image is in the main images folder (you will have to FTP the image to that folder.




