Appearance → Customizer → Visuals and putting the code into the Custom CSS field.
The rest of the snippets require using the child theme. You’ll need to paste the code from the snippet into the Child Theme’s functions.php file (you can find the base for it here).
Web3 World Demo
Recreate the custom styling of one of our demo sites
Increase Page Width
Learn how to change the width of your website
Change Resource Slug
A guide on how to change the resource slug prefix
Change Collection Slug
A guide on how to change the collection slug prefix