First, you'll need to upload your photo(s) to a free photo hosting site like photobucket, or walmart.com. Make sure you size it to the size you want it displayed. Once uploaded you enter the following code in your message (or signature if you want and image to show every time in a message).
Put this code in the message for an image: . Fill in the 'URL of whatever image' with the URL of whatever image you want to display. Most of these sites will provide the http:… link address to each picture so you just copy and paste it in the appropriate spot in your message here. Use [ Preview ] in the message posting window to make sure it's what you want and then [ Post ].