Using module suffix

I am using The news of the world II template, and I would like to use the variation option "color" for a menu module. The problem is that i can´t get it!!! I have write with and without "" in the class suffix but i have not any results.

Who can help me to get my menu in a color? What and Where I have to write it? Thank you.

Remember about white space before name, the suffix should be ' color' not 'color'.