Buffalo AirStation WHR-G54S User Manual page 9

Log in to the Configuration Tool
L
aunch a web browser on the computer that you're
going to use to configure the AirStation.
Enter 192.168.11.1 into the URL field. Naturally, if you
change your AirStation's IP address, you'll have to enter
the new address instead.
A window will open, prompting you to enter a User ID
and Password.
Enter root as the User name and leave the password
field blank.