I see the Mono forums here:
http://go-mono.com/forums/If this is the forum where you have posts, then it is in the old Nabble system. You won't find an option in that system to delete your account, but I can delete all your posts if you want to. If you really want this option, you can give me a link to your account or to a post you made and then I can delete all the rest. Is this what you really want? Note that this will destroy your discussions and prevent other people from viewing them.