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I don't think you can any more , try uploading them to an external site and posting a link,click edit on someone elses post to see how they posted their link
Oh it apears that this is no longer possible (edit bit) ...put {url } link web addy here {/url} for a link to a picture hoster(replace { &} with [&] though .Use search funtion to find a question someone else has asked on a similar Q