There are two ways to add an image to a forum post.
The first is by using the upload button at the footer of the message. Simply select your image and press upload.
The second way is by using the formatting options that are found in the text area. First, click on the text area.
Next, press the picture icon (found fifth from the left of the taskbar). You will then be prompted to upload a photo via a upload box on an Upload tab as seen in the picture below.
Once you’ve selected the image you want to upload just press Send to server. You see a message confirming the picture has uploaded followed by an Image info tab (you can change the image size here if you wish). Once you’re happy press Okay.