Hello. My name is***** to JustAnswer. I'm reviewing your question now, and will post back with your reply momentarily.
To delete your icloud account:
Then go to your mac settings if you want it off mac too:
Go to the Apple menu at the top left of your screen and select System Preferences. Choose the iCloud panel. Then click on "Sign Out" to disable the iCloud account on your Mac.
Let me know if you need further help.
Please rate the 5 stars at the top of the page to close out this question as it is the only way i amcredited for the work done with clients. Or, reply to continue if further troubleshooting is necessary.~Franklin