Ditto, add a reply to the screenshot thread in the films/screenshots forum. Attach the files. Once posted, right click each link and "copy link location" then post it in your actual body with a IMG tag. I will post with attachments, then edit the post and insert the actual images I've already attached.
Once they are attached in the screenshots forum you can use the IMG tag with that link on any other forum as well.
EDIT: Not sure but I think you might need to be logged in to see them when you do this, but I am anyways so it doesn't affect me.