I don't mind at all; editing programs is one of the best ways to learn programming. It's why I released it under the BSD license.
I will add that, as my program was released under the Modified BSD License, yours is, too, and needs to contain a copy of the Modified BSD License with it. This isn't the GPL, and so it doesn't require you to release the source code(though I do request to see the source code, I like reading changes people have made, but it's your choice), but it does require you to make it obvious in your distribution that it is under the Modified BSD License.
I am not trying to nitpick; those are the terms of the license. You may (obviously) add yourself as a contributor of the program, but you must keep a copy of the license with it.
A copy of the license is available in LICENSE.txt, either in the downloaded ZIP file or in the GitHub source.
It won't let me change the world type.... nor will it select all my saves in the list... Do i need to do somthing to fix this???
If the world is a save made from before 1.8, you have to open it up in Minecraft 1.8 first, and then save it again. 1.8 added data to the save file that my program uses for switching the game type, and if that bit of data isn't there, my program won't try to change it. (I could add the data myself, but I wanted to make sure I didn't mess anything up.)
Are all your saves in your MC save folder? And are they all in your system's default place for Minecraft saves?