Your website is built on the WordPress CMS with the theme Enfold. Most theme settings can be left alone, but you will need to visit the Enfold tab in order to change the Social Media links featured in the header and footer of your site.
To do this, visit Enfold > Social Profiles and enter the links to each social media platform you would like to feature.
Click the + to add a new profile, then select the platform icon from the list on the left, or click the x to remove a profile.