Let us look at social media icons in the footer menu.
Go into Site & Pages and then Edit one of the pages that has the footer menu in it.
Scroll down to the bottom, click the Settings icon in the Footer Menu, come across to the right-hand side Settings Menu and go down to Icons. Here you can Edit or Delete existing icons or Add New Icons.
Let's Add New Icon Menu. Click the Blue Button with + to add YouTube icon. Select the YouTube Icon. Make it Visible to All. For Action choose Go to Link and drop your YouTube link in the Link Box. Turn ON Open in New Tab & click Save.
Now you can see YouTube Icon in the footer. You can keep adding your social media icons and once you are finished, click Save & Preview.
To test the link press the YouTube icon and it should take you to your YouTube channel.