How can I switch to my apple account
How do I change my apple account
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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 change my apple account
See this Apple article: Change your Apple ID
Change your Apple ID - Apple Support (SG)