You can add customizable social media icons to the footer of your website, just below the contact information. This is only available in the _props.pcf file within the root folder for your site or the folder where navigation is restarted.
Open the _props.pcf file in the root folder for your site.
Look for the Social Icons Editable Region and click the green button to enable editing.
For each icon that you want to appear, enter the URL for that social media platform in the corresponding cell.