Just drag your mouse in the right corner of the screen and click Terminal

Type the following command: sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Add the name and password of the desired network:
network={
ssid="B2midia"
psk="B2midia2018"
key_mgmt=WPA-PSK
}
Click Ctrl+X to exit and Y to save the changes
Press the Enter key and type reboot to restart the player
To check procedures related to Raspberry Click Here.