To add social icons, you can simple use WIX free icons or icons from Google. To get icons from with, simply go to the add element once again and click on social. You will see the many icons including Facebook, Twitter, Google+, Instagram, Pinterest, YouTube and many more. Just drag and drop these icons from the social add element to the right part of your page.
Once in the navigation, you can choose between many different styles of menus. Once you choose the navigation you would like, WIX will automatically include each of your pages within the navigation bar. To place on your page, just drag and drop. Once on your page, you can fix to the whichever size you would like. Big or small, it is up to you. Also remember to place within the header of the page, as the navigation will then show on each page of your site.