Open the attachment, and copy the URL. In this case it is http://www.xxxporntalk.com/ubbthreads/uploads/363974-Crystal02.jpg
Edit your post
Click on the image link in the Instant UBB Code list
Paste in the URL for the image
Move the image code if you wish, so you can put,

-Chuck, Vegetarian fanboy

Under it.

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Fuck 'em all but nine.