How do I change my Apple I cloud
How can I change the password for I cloud
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You are sign in here . . . with your Apple ID & Password (?).
Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.
You can’t merge multiple Apple ID accounts.
See -> If you can't connect or sign in to iCloud
If you can't connect or sign in to iCloud - Apple Support
Have you forgotten your password? -> See this Apple article: If you forgot your Apple ID password
https://support.apple.com/en-us/HT201487
Then see this Apple article: What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support