Roger Moore

Is there a way to edit songs in the song library? I’m trying to learn Mighty to Save and see that some of the chords over the words are different than you are singing them in the tutorial. In the verses, the chorus seems to be ok.

I just bought a guitar a couple of weeks ago and started playing some chords. My question is how long does it take to get your fingers toughed up? I can only play for 15 minutes max before my fingers get sore.