Just click on the colors when you want to go to the next one. For the strumming it’s just down, down, up, down. You change the note when you finish the strumming pattern, I believe it’s simple, but you’ll be the factor for that. Good luck, hope this helped!! :D
I got help from @_alstro3meria_ with the click thing, go read her story too, it’s very entertaining.
