There is no separate button in routers where you can reset the password or a specific setting. If you have forgot password to Asus router, you will have to reset the router to default settings. Thereafter, you can change the password. Let’s have a look at the steps.
Steps to reset password:
Press and hold the reset button on the router, the router must be switched on.
Connect your device to Asus router and go to the set up page.
Under the settings type a new password.
Type the password again under new wireless settings.
Log in through the new password.
Read more: https://connectrouter.com/forget-asus-router-default-password/