using command prompt how can i change my gmail useame on my local account back to microsoft

Using command prompt, how can I change my Gmail address useame on my local account back to Microsoft. It doesn't let me sign in. You see my Gmail address but when I put my password in, it said to change my Microsoft password to sign in. But it's not a Microsoft account. Somehow I ended up with my Gmail address as my sign in local account. I also don't see the option of changing my useame. I can only sign in as a built-in administrative.

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