How to set social media icons:
Go to Appearance >> menus. Click on create a new menu link.
Enter menu name e.g.
social link menu and click on Create Menu button .
Go to Custom Links section on left and enter your social media url in URL field and social media name in Link Text Field click on Add to Menu button.
Similarly add as many social media url as you want and in last check the Social Links Menu checkbox in bottom and click on Save Menu button to save the menu.
Now go to Appearance >> Customize >> Theme Options >> Social Options
And enable checkbox to display those social media links in footer and on home (If you have home page setup.)