Which one? Why? In general, posts should not be deleted because they could be useful to a future reader. However, sometimes we make mistakes and post things we shouldn't. In that event, you may be able to delete the message yourself by clicking the down-arrow to the right of the subject line and selecting Delete. If you don't have permissions for that (not sure who can and who can't) then try reporting your message to a moderator ("Report Inappropriate Content") and asking them to delete it.
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If this reply helps you, Karma would be appreciated.
