1. Just add the shortcode: [metaslider id="212"] to the text area.
2. Check the Execute Shortcode option.
3. Set the Hook to where you require it*
4. Set the Display Rules > Location to where you need it eg. if you want the Home Page then the location is Front Page
* The hooks vary on what page you’re viewing. For example the: generate_before_entry_title only exists on a Post not a static page. Instead try the generate_before_content hook.
See here for the common hooks: