How do I open my iTunes account
How can I use my iCloud
iPhone 6 Plus, iOS 12
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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.
How do I open my iTunes account
Tap iTunes Store on your Home screen & sign in.
How can I use my iCloud
See -> If you can't connect or sign in to iCloud
If you can't connect or sign in to iCloud - Apple Support
Check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID
If you forgot your Apple ID email address or phone number - Apple Support
OR see -> Having trouble signing in?
https://iforgot.apple.com/password/verify/appleid