Splendor - Social Media Icons
This theme uses the Simple Social Icons Plugin. This plugin automatically installs with the theme.
Navigate to Appearance > Widgets and drag the widget labeled “Simple Social Icons” into a widget area.
The demo displays them in the Nav Social Menu widget area.
Configure the widget by choosing the icon size and color, and add the full URLs to your social profiles.
Here is a screenshot of the settings used in the Splendor demo: