Hi,
Thanks for your interest in Nicepage!
If you mean a Nicepage Online website, open Nicepage Online, find a needed website and click on Delete Site.
Let us know if you need our further help!
...................................................
Sincerely,
Paul C.
Nicepage Support Team
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With web app, delete the pages and republish, or delete the entire site.
With your own host, use cPanel or Filezilla to delete the files.