Hai, this is how you install Minecraft Multiplayer Bukkit Mods in written steps if you missed a step :U
1.Download Bukkit Server Tools.rar in the description(above) and open with winrar.
2.Make an folder on your desktop, name it whatever you like.
3.Extract the contents of Bukkit Server Tools into the folder you've just made.
4.Press run, and let it create a world, once it is done close the run.bat and start it up again, there should be no errors. Close the run.bat again. (IF YOU ALREADY HAVE A WORLD FOLDER FROM ANOTHER SERVER YOU CAN JUST PLACE IT IN THAT FOLDER).
5.Download the MMO Mod from the description and drag and drop the mcMMO.jar file into the plugins folder inside your folder on the desktop.
6.Start up the server with run.bat again.
7.Connect to your server
NOTE: TO update your server download the latest crafitbukkit jar and rename it to craftbukkit.jar and overwrite the old one.