including new field to views_nivo_slider
The issue here is that the views_nivo_slider only accepts three values: an image, a link and a title, and therefore doesn't have anything inside it to display another field/description.

Now, if instead what you are saying is that the title isn't showing up with the image, then you need to go into Views' Row Style: Views Nivo Slider configuration and tell it what field you want to use for the title.  You do that by clicking on the wheel/gear widget thing to the right of that and then select from the menu.