Poor Molly... 1. No changing sprites. You're only allowed to change yours. You can add more dialogue to other characters, but you can't change the dialogue. 2. Don't change the background music. You can change the background though. 3. You can move/shrink the other sprites, if you're running out of room. 4. Eh... Nothing else, I guess.
ADDED FLYING TEXT >:D credit to everyone including Sobsz and the most important MiiMolly-San