I need to change the Apple ID due to I forget my password Apple id
I need to sign in to new Apple ID
iPhone XS Max, iOS 14
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If you have forgotten your Apple ID password?, see -> Change your Apple ID password -> Change your Apple ID password - Apple Support
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
BTW:
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.
What happens when you use the same Apple ID & Password that you use to sign in here?
See ⤵️
Sign in with your Apple ID -> Sign in with your Apple ID - Apple Support
Contact Apple for help with Apple ID account security
Contact Apple for help with Apple ID account security - Apple Support