How do you delete photos from iCloud

When photos box is turned as on see this article https://support.apple.com/en-in/guide/iphone/iph961b96c4d/ios

And you have configured the photo application by signing in with Apple ID and password with iCloud server the photos can be deleted from www.icloud.com using a web browser ( sign in with Apple ID and password ) and see the steps in the link https://help.apple.com/icloud/#/mm08b49040b5

https://support.apple.com/en-us/HT204247

You need to save them to external storage and delete from the device ic library is mirroring service.