Navigate to MMA's sign-in page at https://my.meritamerica.org/learner_accounts/sign_in

Click "Forgot your password?", under the Password input box
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Input your MMA account email address and click "send me reset password instructions"
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Look for an email called "Reset your Merit America account password"
If you can't find it in your inbox, make sure to check your spam and trash folders!
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Click the "change my password" link in the email
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Input a new password and confirm.