Do you want the plugin? But not sure how to install it? Follow this guide!
#1:
Click the 'Download' link on the right of the main page of the plugin
#2:
Once it has downloaded, copy the file to the plugins folder in the servers root
#3:
Start up your server, check if there are no errors in the console.
#4:
Login to the minecraft server, and type the command /killer in chat. If there are no errors in chat or console you have installed KillerRewards!