Can you help me, how to delete my introduction?

Done.

Do you have any more posts you would like deleted? If so, perhaps you could make a list in one post. We don't delete posts that have received replies, but we can delete those that remain unanswered. It's late evening where I am, so I'm off to bed. If you post additional deletion requests I'll take care of them when I come back, if they haven't been handled by another moderator or administrator in the meantime.