I'm told to use Root Explorer, go to /system/app, and replace MMS.apk.
I went there to try it, and can't even find MMS.apk. My stock messaging app works perfectly fine, so I know it's somewhere...
What am I doing wrong?
I've attached a picture of what things look like.
EDIT: I found a search function on Root Explorer, which tracked down the file in /system/priv-app.
I apologize for making this thread. I did plenty of research before posting here, but never considered the search function. (I don't use Root Explorer normally. I downloaded it just for this.)