One thing that needs to be stressed, especially to newcomers, is that ImageShack is not affiliated with this forum. When you upload an image to ImageShack, you are putting your image on a third party hosting site. The forum software does not know where to find the image, so you need to copy and paste the image location (or "URL") into your post.
If you merely upload the image and then click "Post" to post your message to the forum, the image you uploaded will not be seen. It will be somewhere on ImageShack's website, but nobody will know where to find it, meaning it is essentially lost.
I think duplicate posts made by users trying to use the ImageShack tool unsuccessfully need to be removed since the forum already has rules in place regarding post counts to access certain forum services.