how do you attach images (i.e. a Royal seal)

[Khytenna]

im trying to attach an image to a post. ive noticed that some people are able to put a seal of there nation at the top of the page , im just wondering how you would do this?

[Solm]

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[img]INSERT URL OF IMAGE HERE[/img]

For Example:

This:

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[img]http://www.nationstates.net/images/jg.gif[/img]

Would Create this: