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Yes, the router is suppose to do that. For every one character/keystroke, on the screen you get 3 stars ***. That's normal.
Some of the Username/Password combos it might be are: admin/password1 or admin/password.
If you are still having a problem logging in, you can reset the router (by holding down the reset button for 10 seconds), then try to login. This time, when you try to log into the router, it will ask you for a new username and password.