First off, in order to play in Server Mode, it is required that you have a Registered Copy of Kali. You will also have needed to setup FBPro98 for use on Kali.
1)To set up a game on the MNF Server, highlight the MNF Icon over to the right. You will see the main server that is listed there.
2)You will then highlight the description for the server listed and double click on it.
3)Once you've double click on it. you will now be on the server. Once you've done that, all you have to do is right click on the icon below and click on "Run On Server" and your game should begin.
That is basically how you do it for MNF Room Mode. Make sure that your configuration for FbPro98 on Kali is setup per the setup instructions on the website. Also, please be sure of the following. Just a reminder.
If the game locks, meaning it appears to be doing nothing, DO NOT CLOSE THE GAME. Wait at least 5 minutes the first time it happens before you close it. If it happens a 2nd or any time after that, wait at least 3 minutes. Note: if you get any file transfer error after the long wait, hit ok and the game will continue.
Thanks to Paul Cabrera and Nolan Denson of the IFL for their information as their notes on how to play FBPro98 in server mode is the basis for this setup guide.