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You as a member can be deleted from this forum, but as I remember and saw.. all your posts will stay in the database, except it will be posted as anonymous or guest. And for the hosting account, you can do it your self as mentioned above
Actually, it isn't possible to delete all of your posts. I'm not an admin either, but your account may be deleted, but not your posts. This is to maintain continuity in the threads.
I'm not an administrator or a moderator here, but can I ask, "Why do you want your account deleted? Is there something you think is wrong with the service, whether the forum or the hosting, that we should know of?"