You can play UnderGround - (BALKAN) by adding the server in the Minecraft launcher.
On Minecraft Bedrock Edition, open the Minecraft launcher or Minecraft app. Go to the “Servers” tab and press “Add Server.” Enter the UnderGround - (BALKAN) IP Address 31.214.247.41in the “Server Address” and the UnderGround - (BALKAN) port 19132 in the “Port.” Then press “Save” and start playing.