What’s going on!! – Checklist Parent - Mom and Dad Family Calendar Planner and To Do Check Lists Review

This complaint applies to me as well “App crashes and I can't put a complaint in for I can't find out who to give this complaint to AND I paid the $2.99.” I’ve had this app for sometime now. I am not able to log into my account on my devices, nor does it respond to “Sign I’m using Facebook.” How can this be fixed?
Review by Green Power battery on Checklist Parent - Mom and Dad Family Calendar Planner and To Do Check Lists.