To prevent unauthorized persons from using your wireless network, your Sunrise WLAN modem comes with a preset personal security key (a 16 digit PIN code). Only the users who have entered this security key into their computers and devices will have access to your wireless network. You can find the security key on a sticker on the bottom of your Sunrise WLAN modem.
To change your Fritzbox security key, you must connect to the Fritzbox user interface. Make sure that your computer is connected to the Fritzbox via a LAN cable or via WLAN. Then enter http://fritz.box or http://192.168.178.1 in the address bar of your Internet browser (Firefox or Internet Explorer, for example). You must first set up a new Fritzbox password to protect it from anyone tampering with and/or making changes to your configuration. After this, you can change the WLAN password.