If you're talking about setting up RCON messages running all the time.
Download CoD Rcon tool. Login (if you're using PBBans, then you obviously have PB) if you don't have PB then you need it. Login to your server on CoD Rcon tool, then just click "Messaging"
Do the messages you want, and once you've done that, click "Set as PB Task". This will make PB run the messages when the server is running without you having to have CoD Rcon tool even running.
If this dosn't answer your question either PM me, or reply.
Razzen~