Say you want to use the PBDO user banner.
Add these tags [IMG][/IMG] to the link (
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So it looks like this [IMG]http://i.epvpimg.com/0xnng.png[...]
I didn't put the end one in so you know what it looks like.
Then once you actually fill it in properly, it looks like this
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Also, you can press the insert image part, and that does the tags for you :)