You need to speak to the staff here. Thing is, you need to ask yourself what you are running from, and why. If you have posted information about a scammer and you think he's going to track it back to you, then you have to first check who it is and where they are. Likelyhood of a 'visit' is remote, especially across international borders.
Again, you need to speak to the staff directly and in private, start with the site admin [
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Google is only one of thousands of search engines, and plenty will already have indexed your posts, along with the others here. There's no way for you to remove them all, so you have to concentrate your efforts here.
Again, speak to the site admin, and explain in full what the problem is. If the team can help you, or advise you further, then they will certainly do so.