Are you referring to the modem's password or the wifi password? Because if it's the modem's password, normally its password is " @l03e1t3 " (without the quotes). After you logged in to the modem's page. Just go to the settings and change your wifi password there.
not sure if you are referring to pocket wifi or wired na wifi router.. but either pocket wifi or wired wifi yan.. you may connect your laptop or computer via LAN cable if wired yong wifi nyo or via USB if Pocket wifi. then you may access the GUI / dashboard and change your wifi password...