Second, the photo has to be hosted someplace on the web, such as a site like Photobucket or Tinypic or your own website.
Third, Get the URL address and copy and paste it between the "img" tags in the edit window. (Click on the "Img" button to insert the "img" tags.)
Fourth, Click on "Preview" to see if it worked!
Here's a sample:
![Image](http://i1191.photobucket.com/albums/z472/debron11103/Voyager/howtopostphotos_zps77b7127e.jpg)
Here's the result:
![Image](http://i1191.photobucket.com/albums/z472/debron11103/Oregon/TimberlineLodge.jpg)
I use photobucket (free.) In photobucket, when you click on your photo, you will see a box on the right side "Links to share this photo." Click on "Direct" and the link will automatically be copied to your clipboard, then simply paste the link between the Img tags.