This theme comes with built in social media icons in the top bar and footer. You can choose from 13 included social icons.
To add a new icons to your theme, see this tutorial: How do I add new social media icons?
Setup Top bar & Footer Icons
1. Go to Appearance > Customize > Social Media Settings.
Here, you will see a list of social networks followed by a text input box. If you'd like to have a social icon for a particular social network, you can type in your username for that particular network.
Several fields require your full social URL: Linkedin link.
2. Once you enter your username into a particular social network's text box, its icon will appear in your top-bar & footer social icon areas. If you leave a social network's box blank, the social icon will not appear in the top-bar or footer areas.
3. Click the Save & Publish button to save your settings.