I'm an old dog who can learn new tricks but only slowly, or with an occasional whack with a newspaper.
Nope... no photo. That one looks like you made a mistake in posting the URL. When you exclude required info, sometimes the freerepublic software reverts to the URL of the thread. In this case, I see a big white box with a little red X — If I right click on it, it says shows a URL of http://www.freerepublic.com/focus/f-news/802064/posts?page=219#219 (this thread)
Can you post a link (URL) of the photo you are trying to post? (Or, even the webpage of where the photo is?) Maybe I walk you through it.
Your computer is probably retrieving the photo from you own hard drive. FR can't do that. It has to be hosted on a website somewhere.
You can sign up at various places that let you upload your photos for free. I use Photobucket.com
Here is a photo to practice with:
What I typed in: <p><img src="http://i64.photobucket.com/albums/h169/ftogyeppf/snoopy-flag-Halfmast-sm.gif">
If you right click on the photo and choose properties, you can see the matchiing URL