Adding a filter

Hi, I am really keen to style this myself and have seen the ability to turn off the plugins default css.

// Load CSS.
		if ( apply_filters( 'shared_counts_load_css', true ) ) {
			wp_enqueue_style( 'shared-counts' );
		}

I realise this will be a really basic question but I’m struggling to understand what to add presumably to functions.php to switch from true to false? Are you able to assist?

Many thanks.