How do you delete your own question from the Apple Support Community?

You can’t delete your question. Only a host can do that and they generally need a very good reason why it should be deleted. Just because you already received an answer to your question might not be a good enough reason. Typically a host will remove a thread if it violates the terms of use or if it contains personal information.

I just checked your subscriptions and it is showing no recent content so I see nothing to delete at this point.

The compelling reason questions remain is that every well-answered question has the ability to help more people than just the original poster. Others can learn from reading your question and the answers provided.