Huawei HG659 Manual page 15

5. Wireless settings can be found under middle "Set Up
WLAN" option:
To change the WiFi settings, enter new SSIDs for the 2.4 GHz
and 5 GHz boxes, and enter a new password. It's a good idea to
write this down on the sticker provided and put it somewhere
handy (like the front of the modem).