Navigate to the File Manager tab in the left sidebar of the PebbleHost Panel. You can now explore the world as you like without getting Kicked for Flying.
Start Minecraft, click Multiplayer and click Add Server. There should be two boxes, Server Name and IP Address. The server name does not matter a bit. Call it.
I as the operator would like to send a "server message", so all the players can read it, instead of me sending the message specifically to each and every.