Catch Box Font and Menu Changes

New to Catchbox, great theme, but I'd like to know if I could make some changes to the following text styles/sizes and if so how I can go about doing it. How do I change the primary menu font and size? How do I change the footer menu font and size? How do I change the sidebar font for the mail chimp widget, where it reads First Name: and Email Address: How do I remove the hyphen and No Comments, after the date and Author name? What code do I need to insert into my custom css to change these options? Thanks and happy easter