If the direction form text in the infowindow is too light (or doesn't appear at all because it is white against a white background) or you want to customize it, add a class "mapdirform" to your template.css.css file. This class will effect the <form> of the direction form.

You can do this by going to Site/Template Manager/site Templates in the Admin backend, then "Edit CSS" for the template you are using.

Here is an example you can add:
 
.mapdirform {

      font-family: Arial, Helvetica, sans-serif;

      font-size: 10px;

      color: #000000;

}

This documentation is provided by Jack Breaks.