You can easily set or change the Ingame MOTD. Everybody can read the MOTD by joining the Server. Of Course you can change the permission or the commands.
motd.set = Players with this Permission can set or change the Ingame MOTD.
/setmotd <text> = With this Command you can set the Ingame MOTD
/showmotd = With this Command you can see the MOTD, which is actually set.
If you need help, feel free to contact me on skype. My Skype Name is "ynk.official". I'm a german Person, but i can help you anyway.
You need the plugin "Skript" to use this Skript. I think you all know this. If you have "Essentials" on your Server, please have an empty "motd.txt". Otherwise you have two Ingame MOTD's.