I hate this app!!!

I liked it at one time when I had this app on my iPhone 6 S plus. I have an iPhone 7 plus now. and I tried and tried to put a passcode in and it would not let me save it every time I open app it says passcode not set if you dont fix the flaws Im deleting this app. No use wasting space on my phone when it doesnt work. FIX IT!!!!!

Susie Q91 about My Secret Diary, v3.3