Custom Fonts can be imported in a number of ways :

1: http://www.wpbeginner.com/wp-themes/how-add-google-web-fonts-wordpress-themes/ 

2: http://www.wpbeginner.com/plugins/how-to-add-awesome-typography-in-wordpress-with-typekit/

What this Article describes is how to add that font to the Salient Theme Options Panel -> Typography Section so users dont have to write up custom css for each element they want to use the new font on . 

Assuming you have the TypeKit Fonts Plugin setup and working with url earlier provided.

Add this to your Child Theme Functions.php file or use Code Snippets Plugin to add below code :

function salient_redux_custom_fonts( $custom_fonts ) {
    return array(
        'Typekit Fonts' => array(
             '"futura-pt",sans-serif' => "Futura PT"
add_filter( "redux/salient_redux/field/typography/custom_fonts", "salient_redux_custom_fonts" );

Which should make your custom font show up like this :