1). First of all plug your fritz.box router adopter to internet socket and switch it "On"
2). Then just press "WPS" button on
3). Go to Wi-Fi Settings and Click on your Wi-FI (SSID) netwrok name and it will ask for password. Fill the password and after that it will automatically connect
4). After connecting just open any browser in your phone/PC
5). Type your router IP address 192.168.... or http://fritz.box
6). Fill your username and password
7). Now you are connected with Fritz.box router.