Auto Start-up?

My endnotes X.O.2 which I run on a Mac automatically starts every time I turn on my computer.  How do I turn this feature off?

At least on a PC, in word, tools, CYWY preferences, there are check boxes to open Endnote with Word and close endnote when word closes.  These preferences can also be accessed from Endnote, in tools CWYW>CWYW preferences.