Need to know how to change from password to I’d when it asks for enter password and I’d

I’d like to know how to change the password to ID when the site only shows password.I’ve tried entering the password and all it says is invalid must enter both password and ID . ie: almost any Apple site

I need to know how to change the password to I’d when it asks for both but only shows password

Need to know how to switch from password to I’d when I need both and it only shows password

Need to know how to switch from password to I’d when I need both and all it shows is password

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