Provided the photo/image is on your own computer the easiest way to post them on here is to click on “Go Advanced” at the bottom of the page in the “Quick Reply” box. Then click on the paperclip – to the right of the single white smiley. “Attachments” will appear if you hover over it.
The “Manage Attachments” box appears once you have clicked on it. Click on “Browse”, select your photo from your computer. The file name will appear to the right of the Browse box. Click Upload and the photo will appear in your post as a clickable thumbnail. Example:-