You are not missing anything. The iOS app works differently than does the Android when it comes to selecting stars from the catalog. You just have to next your way through the selections. I think.
Wes, Southport NC
PMC-8, ES ED 127, 10" LX200GPS, Astro-Tech 8" Newt, ETX-90
Polemaster, Orion ST-80 and SAG
Electrical Engineer, Retired