How do I add a non-Google font -- Neuropol?

You'll have to use CSS.

Is that a web font? If so, you'll have to use @font-face: https://css-tricks.com/snippets/css/using-font-face/

Let me know if you need more info :)

// IN CSS :
@font-face {
font-family:"Neuropol";
src: url('http://intern-dev.obrary.com/configurator-fonts/neuropob.ttf');
}
--------------------------------------------------
element {
font-family: Neuropol, sans-serif;