How can I delete the tag I created?
How come there is no paragraphs? Is it OK to make one?
Just remove the tag from the question. The tag itself will be deleted in 24 hours, if there aren't any questions using it. If the tag is used from a question, it will be deleted in a month (if I recall correctly).
If you find more questions using the tag you created, just remove it, or replace it with the correct tag.