Erasing place holder message

Does anyone know how I erase this message on the “About” page of the Berlin theme?

What message?

Anyway, themes don’t have “About” pages, so this is probably just the default Simple Pages page; you can edit it however you want or delete it from the SImple Pages admin interface.

Thank you for understanding what I meant even when I forgot to paste the text in question. Your solution worked!
Thank you!