iCloud change password
Need to change iCloud password I forgot it
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If you forgot your Apple ID password - https://support.apple.com/HT201487
What to do after [or before] you change your Apple ID email address or password - https://support.apple.com/HT204071
If you still need help:
Contact Apple for help with Apple ID account security "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."
https://support.apple.com/HT204169
or
Contact Apple for support and service - "See a list of Apple phone numbers around the world." - https://support.apple.com/HT201232