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No, you can only post your pictures in the files forums.
You post them by first taking screenshots from the theater, and adding them to your fileshare. After you've done that, log in here on bungie.net and open your profile here. Go into your Halo 3 section, and open your fileshare. Its will display your saved file slots. Find the one that you want to post, and press the button entitled "publish to forums" located at the bottom of that slot. You'll then be queued to create a topic and body. Do that, press submit, and you'll have your topic.