Changing router password

Login to the Modem \ Router,
Your Modem IP is 192.168.1.1 for lan \ ethernet users (put 192.168.1.1 into IE or FIREFOX URL bar)
for USB users type 192.168.1.2 in URL bar
login by admin user name and admin password , [ by default it is admin ]
to change the username or password
and search for the "Change Password" Option there!
after it reboot the modem .