On the sign-in screen, select Forgot password.
Enter your registered email address.
Open the reset email.
Select the link.
Enter a new password.
Enter it again to confirm.
Sign in with the new password.
The reset link is single-use. If it's expired, request another.
Tip - Enter the new password at the sign-in screen rather than accepting a saved one - a cached old password is the most common reason a reset "doesn't work".
Resetting your password does not change your two-factor authentication. You'll still need your authenticator app.