you have to log-in as a user.
on the address bar of your browser, go to the IP address of your router/device (usually can be found at the back of the routers)
you have to key in your username and password of your account. (the default username is 'user' and for the password, you can call globe hotline and ask for it and they'll provide you the info)
once you have logged in, you can now set/change your wifi password.
I HOPE THIS HELPS.
pano kong nag iinvalid po yung use at password na sa router po?pano po yun?