You can not delete your own post, whether topic or reply within a topic, other than to "edit" it within 15 minutes after posting. For that window of time there is an icon that appears above your post that allows you to edit it. If you wish to clear the information it is usually done by just typing "ignore" or similar which effectively tells users that you changed your mind about posting. Of course you can come to the Feedback About Discussions and ask that the post be reported to the Hosts or to ask for a Hosts attention here to try to delete it if possible. There is further information in the Help & Terms of Use link in the sidebar at the right ->.
I saw your other two posts and thought they were both informative and helpful so I'm not sure why your would like them to be deleted but I may be missing something that would cause you to wish one or both to be deleted.
It's always helpful, to those searching here in the AD, if you are in that situation to mark the post as answered but to also leave the method/answer you used to solve the problem. This will help others if they are searching the AD and they come across the thread for an answer to a similar problem they might be having.
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