I want add Mail Munch in our website and they say that I have to paste the code on every page. How can do this? In CMS>static block>footer links don't work cause this is not enabled.
You can add the corresponding css/js in
<theme_dir>/Magento_Theme/layout/default_head_blocks.xml and it will add that js/css to all head of frontend pages
.For more details read this article on magento devdocs -