Point your web browser at
http://www.gmail.com
If another account comes up, sign out of it by clicking the avatar in the upper-right then clicking "Sign out."
If you then still can't sign in to your account, click the "Need help?" link on the sign-in page.
To change your password once you've signed in, click the avatar in the upper-right, click "Account," click "Security," then click "Change password."
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