I am not sure what the issue is, but you providing me with that reminded me that there is a second place to work on the footer widget. When I am working within Widgets, Footer tool, I can now access the icons. However, if I go to Customize, Widgets, Footer Widget area, that is where the issue is and where I am am not able to add social icons.
Now that I am reminded I can work straight from widgets, there should be no issue! But thought I would let you know that I think there is a problem when working through customize>widgets>Footer Widget
Thank you for all of you help, I really appreciate it and it has been wonderful support!!