Adding custom social link icons to repalce the default “link” icon

Hello Is there a way to add link icons for sites that are not in the default icons included with the Photo Focus Pro theme? For example, I want to link to the site "fetlife". The icon doesn't exist in the social icons options. I can add the link to the site, but the icon displayed is the generic "link" icon. I would like to import my own icon have display it instead of the generic "link" icon. Thanks