Question

how do I delete a file

Answer 1

If you mean a profile, you can't.  But you can recycle the profile number for someone else with the same Last Name at Birth (say a sibling or parent).

Answer 2

Jane, the only person with last name of Henry that I see in your edit history is https://www.wikitree.com/wiki/Henry-6387. That's an Unlisted profile, so all I can see on the profile page is:

Living Henry

This anonymous profile represents a living person with the surname Henry born in the 1990s.

Information on Unlisted profiles can only be viewed by friends and family members on the Trusted List. Send a Trusted List request.

To ask a question, send a private message to the profile manager, Jane Morgan o'neill.

I imagine that you are concerned about this person's privacy, but I don't think there's much of any reason for concern. The profile is invisible to anybody who isn't on the Trusted List (probably that means it's invisible to everybody who isn't you).