Which config file do I edit?

Idiot here...
I have searched for turning off the auto-paragraph and ran across all the posts with comments concerning fckconfig.entermode/fckconfig.shiftentermode in the fckconfig.js file under the fckeditor root folder. I changed the p to a br, but the changes have not taken effect. I have closed and reopened my browser window and cleared the cache.

I noticed fckconfig.entermode is mentioned in a LOT of files throughout the _source/internals directory, but I figured they are simply calling the variable from the fckconfig.js file in the root folder.

Why do my settings not take effect?

Thanks,
ID10T