Editing an APK
So... I'm in the beginning stages of messing with the stuff. Tried to do something simple. I just edited Pandora APK and all I did was change the boot up image. (I added text to original file under where it says Pandora) Then, put the APK back on the phone. Uninstalled Pandora and tried to install the edited APK. Went clicked install and then it wouldn't.
What did I miss? Do I have to resign apps?