How do I add directions links?

You can display directions links in pins label.

Enter "From here" (or your preferred text) in label field, highlight it and select link option on toolbar below.
Enter %DIRECTIONS_FROM% in URL field and close the window.

Enter "To here" (or your preferred text) in label field, highlight it and select link option on toolbar below.
Enter %DIRECTIONS_TO% in URL field and close the window.

By clicking on "From here" or "To here" links in published map, Google Maps website will be displayed with directions from/to pin location.