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To change the wireless settings on any Telus router, go to the router page - http://192.168.1.254 and there it'll ask you to log in. The default username is admin and the password is telus. In some cases it'll ask you to confirm the modem serial number (located on a sticker on the modem) and to change the router password. When you change the router password, click on wireless settings and you could change the SSID (wireless username) and password over there. Keep in mind that once you change them you'll have connect all your devices wirelessly again.
Hope this helps you!