Richard,
Once you have successfully uploaded the image there will be a url of the image below it. You have to drag your mouse curser across the entire image and then click on copy. Once this is done click "back" shown on the screen twice. This brings you back to your post. Now scroll down the the optional image url box and delete anything that is there. Now place your curser in the url box and click "paste". If you have any doubt that you have been successful select Preview message at the bottom of your screen. You should see your message and Pic. Now go to the bottom of the screen again and click on Post message. It took me months of trying, hope this helps.