A Question about submitting image (1 Viewer)

Why the IMG code is always off even though I clicked "Yes" when I editted my profile? I have many wonderful pictures of Ale I want to share with others, but some of them are too big to be attached. So I want to use the img code,but it just shows a hyperlink. What's the problem? Thank you!^^

IMG code is only on in the Off Topic forum.

Thanks ^^