Dainty - Social Media Icons Plugin
This theme uses the Simple Social Icons Plugin, which can be obtained here or by searching in Dashboard > Plugins > Add New.
In your Widgets menu, drag the widget labeled “Simple Social Icons” into a widgetized Area.
The demo displays them in the Nav Social Menu and the Widget Above Footer areas.
Configure the widget by choosing a title, icon size and color, and the URLs to your various social profiles.
Here is a screenshot of the settings used in the Dainty demo: