[General] How do I remove an account from the Play Store?

Version 4.0.4

I obtained an Android from a friend and created a second account for the Play Store. Now I want to remove the initial account (first on the list). It has as its ID a non Gmail account and I do not know the password associated with it.

I went into App settings and for Google Play Store clicked on Clear data. That did not remove either account.

What are the step to take to remove the initial account?

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