The best way to add/edit your motd (message of the day) is to open notepad on your desktop.
Once opened type in what you want your motd to say then save as ircd.motd
Once you are happy with how your motd reads then you can SSH in via a fileserver program & upload it to your main Unreal3.2 folder.
To load onto your server just rehash the irc name you uploaded the motd to.