You can play The Gaggle SMP 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 The Gaggle SMP IP Address thegagglesmp.ddns.netin the “Server Address” and the The Gaggle SMP port 19132 in the “Port.” Then press “Save” and start playing.