Adding more Social Icons

I would like to add more social icons to the list - like HOUZZ. I prefer to add new, but would be OK with using the custom CSS feature to replace something like Instagram with Houzz. Is this possible? Houzz is very important to my customer. Here is my site - http://pondsmd.com/wordpress. As you can see, I added a Houzz icon using a custom widget in the top bar, but that takes up too much space on the page.