You can play Azkaban 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 Azkaban IP Address azkaban.dyndns-remote.comin the “Server Address” and the Azkaban port 19132 in the “Port.” Then press “Save” and start playing.