umo54931,
Steve hasn't responded so I'll give it a shot. I'm not familiar with the WordPress system for web site management but I'm quite sure there is no eBay interface included. As with any other web host not specifically designed for use by eBay sellers a process of determining the URLs and using with HTML is necessary.
Specifically, the URL http://blahblah.com/index.htm is, as you say, to a web page. Each individual image uploaded to a host will acquire its own unique URL. That URL combined with an HTML image tag will cause it to be displayed. For example:
<img src="http://blahblah.com/mypicture.jpg">
How to figure out what URL to use will vary with hosting service used.
Hope this helps (at least a little),
Rob
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