Hello, when typing in the adress http adress in the browser it goes to my Wlan modem

it goes to my wlan modem Zyxel wmg3625-T20A
My ethernet connection works when connected to the router NBG-418N v2 but i am not able to type in the password when trying to access wireless. Long story short, tried everything but unable to connect to the router in order to give the user name and password

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