No you don't use the image link.
when you make a post.... click the box to "preview your post and/or attach a file.
Then on the preview screen, click "Browse" and select the image from your hard drive. It will upload it to the forum... and the post will have an "Attachment" link at the top. Clicking that will dispaly the image.
There is an "Inline Image" hack posted here, which will display any attached images inside the posts.
But the "Image" tag is not used for attached images.
