How do you get the Neural Net to work?

Hi,

For a project I am truing to predict rating levels associated with user reviews from Amazon Reviews using the available features. 

Inside cross validation I have Random Forest and in Split Validation I have Neural Net (which won't work). Should I use Neural Net? How do I get the model to predict more than just high? How do I get the model to predict high, medium, and low?

Attached I have the data set and what I have done so far. I am only able to get the model to predict every rating as high. 

Any help would be very appreciated.

Thanks!