Unhappy [Q] Help with the Generic.kl, please?

I flashed a new rom on my Galaxy S3 AT&T. It was the Resurrection Remix for KitKat. I love the rom, but the only problem is that my phone now has soft keys, added to the hardware keys on the phone. I never liked the on-screen 'back' and 'menu' buttons. That's why I bought an S3 in the first place. But I had to reflash this rom a couple times to deal with 'Unfortunately, ... has stopped.' messages. Now it's finally working, but I really hate these keys. They waste screen-space and ruin the otherwise perfect scaling of things on my phone.

Yes, I know about the Expanded Desktop, but I like to use the Themer Launcher, which scales its widgets according to the soft-keys, present or not.

My issue is that I simply cannot save the Generic.kl file. I made the corrections, but I can't save the file. How do I do this?