Connection for Chordana Play for Piano

Hi! First public post ever! I recently puchased a Casio PX870. I had to give up my beloved Gulbransen in a move I ended up not making. I was hoping this piano will ease the pain for awhile. I am trying to find what I need (to buy) to connect my iPad Pro to the PX870 to use Chordana Play for Piano? I find the Casio online user manual a bit confusing. Also, I noticed the keyboard seems harder to the touch than the model I tried out, and the pedals don’t seem to do a lot. Is there a setting for either (or both) of those I can use? So it looks like my post has several questions. Thank you for your time!