When done correctly, your image will appear, such as this:
This is just one example of the versatility allowed in your classified ads. ProBoards supports the full compliment of UBB Code, a modified subset of HTML that allows you to add code to your bulletin board posts. Just Google "UBBC" or "UBB Code", and you'll find a million references out there.
Finally, to edit an existing ad, rather than posting a new ad, simply click the "Modify" button on your original ad.