Using YARPP with Custom Post Ui

Hi,

I am trying to use YARPP (Yet another related posts plugin) with the custom posts and taxonomies that I have made using custom posts ui plugin.

YARPP FAQ mentions this –

Yes. To make YARPP support your custom post type, the attribute yarpp_support must be set to true on the custom post type when it is registered. It will then be available on options on the YARPP settings page.

‘yarpp_support’ => true

If you would like to programmatically control which post types are considered in an automatically-displayed related posts display, use the yarpp_map_post_types filter.

But I am struggling to find where to add this line. Please help me.