You will want to go into OnSong > Utilities (gear icon) > Settings > Display Settings > Song Formatting > Chord Diagrams > Left Hand Diagrams > Turn off > Done.
Yes. This can be done by placing a footer tag in the metadata. In OnSong > Select a song > Editor (pencil icon) > It will want to look something like this... Title: Example Artist: Me Key: C {Footer: Type what you'd like} Intro: So on and so forth.
Yes. You will want to go into OnSong > Utilities (gear icon) > Editors > Song Reporting > Select the report you want > Tap the Share Menu (square icon with an arrow sticking out the top in the upper right hand corner) > Select Share Method - Export, ...