Hi agentjulliard,

1—There is no option to add icon after Cart Icon, but you can add social network icons in this form:

<i class="fa fa-{icon-name}"></i> where {icon-name} is the icon from font awesome collection which can be found here:

http://fontawesome.io/icons

Here is how to find the icon name:

(view large version)

Please don't forget to tick this option:

(view on new page)

Then add it to menu item in Appearance > Menus

(view large version)

2—To Edit checkout fields has to be done with code or ani Advanced Plugin that takes care of it. I will provide you to article for it.

https://wordpress.org/plugins/woo-checkout-field-editor-pro/

https://docs.woocommerce.com/document/tutorial-customising-checkout-fields-using-actions-and-filters/

Thank you.