Tap Join on your phone above - Minecraft PE opens with the server ready.
Or add it yourself: Play → Servers → Add Server, name it anything, IP play.eienmc.net, port 19132.
On Windows the same steps work - PE and Bedrock are the same game.
On Xbox, PlayStation or Switch you can't add custom server IPs directly - only Featured servers show up. Workarounds exist (BedrockTogether app, DNS tricks), but on consoles this server is not one tap away. We'd rather tell you that than waste your evening.