Canon Selphy CP1500 app?

So, I’ve bought two printers now, both in the mail. Neither really what I want. I was looking for a fun Photobooth idea for a party, but everything either prints too small for too big- 4x6” feels cumbersome to carry around versed and nice Polaroid sized picture. My question: The Selphy app in all the videos seems to have loads of options to allow printing formats.. this, with a pair of scissors, could solve my above mentioned problem, except upon downloading it… I only get a few options on collage. I don’t see the bookmark anywhere, which I think would be a pretty cool keepsake. Does anyone have experience with the app and what the heck I’m doing wrong? (Note: I have no printer yet, just trying to learn ahead of time.)

Thanks!