1. Push Win+R to open Run
2. In the Run box, type cmd, and click OK
3. This will open the Command Prompt. In this window, type "ipconfig" and hit enter.
4. Look for the line that begins with "Default Gateway". We require the IP Address in this line for the next step.
5. Open your favourite browser (Internet Explorer/Mozilla Firefox/Google Chrome/Safari), and in the Address Bar type the IP Address from the previous step.
6. Depending on your router, you will be asked for a username and a password. By default this is typically admin/admin.
7. Navigate to the WiFi settings, Home Network > WLAN Settings > WLAN Encryption > WPA pre-shared key/Show Password.