Connect the rcon tool using your server IP and your minecraft rcon port (it's the same port as your server port) and your rcon password (set in the server config).
You can now send your commands, do not ommit the / at beginning and validate with enter.
Else you need to add yourself OP (click Here )and type the commands in-game.
Commands list:
/ban: Prevents the specified player from using this server
/ban-ip: Prevents the specified IP address from using this server
/banlist: View all players banned from this server
/defaultgamemode: Set the default gamemode
/deop: Takes the specified player's operator status
/difficulty: Sets the game difficulty
/gamemode: Changes the player to a specific game mode
/give: Gives the specified player a certain amount of items
/help: Shows the help menu
/kick: Removes the specified player from the server
/kill: Commits suicide, only usable as a player
/list: Lists all online players
/me: Performs the specified action in chat
/op: Gives the specified player operator status
/pardon: Allows the specified player to use this server
/pardon-ip: Allows the specified IP address to use this server
/plugins: Gets a list of plugins running on the server
/reload: Reloads the server configuration and plugins
/save-all: Saves the server to disk
/save-off: Disables server autosaving
/save-on: Enables server autosaving
/say: Broadcasts the given message as the sender
/seed: Shows the world seed
/setworldspawn: Sets a worlds's spawn point. If no coordinates are specified, the player's coordinates will be used.
/spawnpoint: Sets a player's spawn point
/stop: Stops the server, with optional reason
/tell: Sends a private message to the given player
/time: Changes the time on each world
/timings: Records timings to see performance of the server.
/tp: Teleports the given player (or yourself) to another player or coordinates
/version: Gets the version of this server including any plugins in use
/whitelist: Manages the list of players allowed to use this server
