Bukkit

So what you need to do is to scroll down to the bottom of your config.yml
By default on the bottom you will have a couple of lines that will look like this.

Now under that you are going to add your own permissions for the arenas that you want. The permissions that you can use can be found here: http://dev.bukkit.org/bukkit-mods/myhungergames/pages/help/tutorial/getting-started/configure-the-config/

All of the permissions you add here will overwrite the ones that are above these which are global permissions. If there is a global permission that you have not added in you specific setup then it will take the value of that permission from the default config. For example

There is a permission called min-players. If you have not decalred the amount of min players in your specific setup then it will read the min players from the default config.

Now here is an example of how a small setup can look.

Now the way you add this to an arena is by adding

setup: <name of your setup>

to your games.yml like this

That is pretty much it!

Have fun!