Colors not showing

Hello Guys, I have installed the plug in to edit the event calendar plug in colores, buen When I go to Category Colors, I can’t see the Colors, any clue?

This is what I see: https://dl.dropboxusercontent.com/u/24078452/Screen%20Shot%202015-09-11%20at%202.10.16%20PM.png
Thanks!

https://wordpress.org/plugins/the-events-calendar-category-colors/