Lost in the CLOUDS!!!
Does anyone know how I can put a lock on my iCloud because I have someone that has access to it and is downloading things please help if you can thank you.
iPhone 12, iOS 15
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They would need to know your Apple ID and password. If your password is compromised, change it as described in Change your Apple ID password - Apple Support
Also see: If you think your Apple ID has been compromised - Apple Support
In addition to changing the password, if you want increased security, turn on two-factor authentication. See: Two-factor authentication for Apple ID - Apple Support