Join using Bedrock Edition
How to play on Bedrock Edition for PC, Consoles, Mobile

Install Android App to Join
Installing this app on your phone makes you able to play on Xbox and PS4

Joining from Windows Bedrock Edition
1. Open Minecraft Bedrock Edition 

 2. Press play 

 3. Press Servers 

 4. Scroll down, press "Add Server". 

 5. Fill in as displayed, press Save. 6. Press United Factions, then press Join server. 

 Done. You're connecting!