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You’re logged-in and posting here using an AppleID and password.

Are you asking about “THIS” AppleID?

If so, you’re already using a trusted device and should be able to simply read your AppleID within Settings -> AppleID[Name].

Then, you can reset your password to something more memorable using these instructions:

If you forgot your Apple ID password - Apple Support

See here -> https://iforgot.apple.com/