It doesn't appear to say anywhere HOW to post a hijack this log. I looked at a post and he'd put it in some box that said "php code", but no box or form of any kind here, and nothing that appears to be to attach files.
You dont have to attach the file. What you do is when you run HiJack This you have it also create a text file. It will then open notepad after the scan and the log will be listed there. From there you just copy the log from notepad and place it in your post.