The numbers that you find in your snapshot correspond to various actions that can happen to a path in your nation: 

0 = The current step of the path changes
1 = The path is completed
2 = The path is abandoned
3 = The path has a new point person
4 = The current step of the path has a new point person
5 = The path is deleted
6 = The path is reactivated 

Complete and current information on how to use NationBuilder is available in the documentation section.