Hi Saguaros,
In Panel admin Joomla I acces to Extensions>>Plantillas>>styles>>ja_eventcamp>>Themesettings>>Heading
I select the font, click on "Select font"
I see the changes reflected in preview. I save changes to the template profile and then I save changes to the template.
When entering the site you see the font without such changes, in fact without styles.
Regards,