Calendar--I accidentally granted Turbotax permission to access my computer's calendar. How do I deny Turbotax from accessing my computer's calendar??

I made this mistake in the initial setup for turbotax 2017.  The VERY first question dealing to  whether or not I want Turbotax to access my calendar.  I change my mind.  I do NOT want them accessing my computer's calendar.  What do I do to change this.  running macOS.