I don't understand – High School & College Apps Math - Manual for Graphing Calculators TI-84 Plus, TI-Nspire CX and CASIO fx-9860GII. Review

I can't even use the app, I try to click on what I need and it tells me how to use it but I can't actually calculate anything..
Review by cheyenneraney on High School & College Apps Math - Manual for Graphing Calculators TI-84 Plus, TI-Nspire CX and CASIO fx-9860GII..