Annoying calendar synch message

I once liked this app, but for the past couple of months, every time I open the app, there is a pop-up screen that invites me to synch the app to my calendar. My two options are to synch or to be reminded later to synch. I cannot dismiss the screen and make it go away. This should be a one-time option that I can adopt or not, and then never see again.

RWS#1 about WorldMate Travel Plans & Flight Tracker, v7.2