How to make a command edit config

I would really like to know how to make a command edit a part of this config file. I have another command working that lists the text in that config file, but I need another command that can edit it. What would be the code for this.

 

http://wiki.bukkit.org/Configuration_API_Reference#Setting_Values

 

Do i replace stringValue with anything?

 

You can use in your onCommand method:
getConfig().set("testpath", args[0]);
This would look like this
/<command> Test , it would set string "Test" to testpath inside your config.

 

http://pastebin.com/72a09iTU
This is the error I get when I used /listwanted and /addwanted. Here is my code:
http://pastebin.com/ESpDd4Xy

 

You did not check if the CommandSender was a player. Not all CommandSenders are players.

 

Yes, I did. Its at the beginning of where I start my commands.