Insert an image in a post.
You cannot insert an image when doing a quick reply, you must use the 'New Reply' button at the top and bottom of the thread.
While creating your post, attach your image file by clicking 'Browse'
Select the image you want and click 'Add Attachment'.
Click 'Preview Post'
Right click on the attached file and select 'Copy Link'
Click on the 'Insert Image' button in the toolbar
Right click on the URL text box and select 'Paste'
Click 'Insert' - you image should appear in the edit area.
Click 'Post'.
You should be redirected to your post, which should display your image.