Hi nonstop,
The src value should point to the location of your image. For example, if you uploaded your image to http://domain.com/images/image1.jpg, the src would be:
<img src='http://domain.com/images/image1.jpg' />
If you want to post a comment at the bottom of this page with the URL to the page where your image is not showing, as well as what and where the image is located, I'd be happy to review further.
Thanks,
- Brad