Jeff, you had it perfect on your second try except that you left of part of the URL from the photo.net site, i.e. the size=lg parameter.(posted 8417 days ago)Your first try was OK except that you didn't leave a space between the IMG and the SRC key words.
What I do first is go to the actual image and display it on the browser. This has the effect of producing the actaul URL automatically to reduce typing and the chance for error. Then highlight the URL in the Location: field, and do a Ctrl-C to copy the address into the paste buffer. Then in the body of my post I type <img src=""> after which I move the cursor to the second " mark and press Ctrl-V to paste the address between the quote marks.