Hi,

I sadly don't speak Spanish (I use google translate), but I hope this will help you:

It is possible to add custom fonts, but it requires some coding. To add a custom iconfont, you will need to use a child theme (you can use the one that comes with the theme). 

Please check example below (copied and filtered out from the theme), but make sure you give unique names to the functions (rename them), then copy the code to functions.php in the child theme:

// step 1, create array of icons:
function orion_add_dentist_icons( $icons ) {       
return array (         
'icon-parodontosis' => '',        
'icon-anesthesia' => '',        
'icon-protection' => '',        
'icon-toothbrush' => '',        
'icon-tooth-seal' => '',        
'icon-dental-caries' => '',        
'icon-x-ray' => '',        
'icon-paradonthosis' => '',        
'icon-patient-card' => '',        
'icon-pin-tooth' => '',        
'icon-teeth' => '',        
'icon-braces' => '',        
'icon-brush-your-teeth' => '',        
'icon-caries-defense' => '',        
'icon-certificate' => '',        
'icon-dentist-report' => '',        
'icon-healthy-tooth' => '',        
'icon-label' => '',        
'icon-medical-records' => '',        
'icon-medical-report' => '',        
'icon-cleaned-tooth' => '',        
'icon-cracked-tooth' => '',       
'icon-dental-calculus' => '',       
 'icon-dental-care' => '',        
'icon-dentist' => ''    );
}
add_filter('siteorigin_widgets_icons_dental', 'orion_add_dentist_icons');
// step 2. connect them to stylesheet and add them into siteorigin
function orion_widgets_icon_families_filter( $families ){    
$families['dentalicons'] = array(        
'name' => esc_html__( 'Dental Icons 1', 'dentalia' ),        
'style_uri' => get_template_directory_uri().'/libs/dental-icons/style-ot.css?111',        
'icons' => apply_filters('siteorigin_widgets_icons_dental', array() )    );                   
return $families;
}
add_filter( 'siteorigin_widgets_icon_families', 'orion_widgets_icon_families_filter' );

First part is the array of all icon names and their characters. Usually this comes with the font itself, you just need to add it into the array,....

The second part connects everything, font name, location of the CSS file and icon array.

Kind regards, 

Andrej