For most Telus gateways, you can configure the options (including the network password) by logging in the gateway's inferface (Wired connection if possible, else you will get disconnected as soon as the password is changed, and you will need to reconnect manually)
simply open a web browser (Not firefox, some pages do not load properly) , and go to :
The login information is printed on the sticker located under the gateway (defaults are - Username : admin , Password : telus) - in case the password was changed previously, simply press the reset button on the gateway for 10 seconds, that will erase all custom settings and let you connect to the interface ..
Hope this helps !
Have a great day