I use photobucket.com or download the app and upload my iPhone pictures to there.
once uploaded there will be a button that says share - click on that and copy the link.
come back to the forum and start a post and click the button right of the envelope.
In order to add an image to your message or your signature, you must have the image already available on a web server and reachable by a URL. This can be an image on your own personal web page, for example. To place an image within a message, simply use the following Markup Tag: