Need help with product label.

The plugin is supported,but I can not figure out where to insert this code.
Through exploring the element in the browser, I move this code and get what I need.
I don’t know where to insert it (in which php file) to apply these changes.
I understand that you don’t have to make websites.
Just a little request for help.

I found only this in the theme files:

if( ! function_exists( 'woodmart_product_label' ) ) {
	function woodmart_product_label() {
		global $product;

		$output = array();

		$product_attributes = woodmart_get_product_attributes_label();
		$percentage_label = woodmart_get_opt( 'percentage_label' );

		if ( $product->is_on_sale() ) {

			$percentage = '';

			if ( $product->get_type() == 'variable' && $percentage_label ) {

				$available_variations = $product->get_variation_prices();
				$max_percentage = 0;

				foreach( $available_variations['regular_price'] as $key => $regular_price ) {
					$sale_price = $available_variations['sale_price'][$key];

					if ( $sale_price < $regular_price ) {
						$percentage = round( ( ( $regular_price - $sale_price ) / $regular_price ) * 100 );

						if ( $percentage > $max_percentage ) {
							$max_percentage = $percentage;
						}
					}
				}

				$percentage = $max_percentage;
			} elseif ( ( $product->get_type() == 'simple' || $product->get_type() == 'external' ) && $percentage_label ) {
				$percentage = round( ( ( $product->get_regular_price() - $product->get_sale_price() ) / $product->get_regular_price() ) * 100 );
			}

			if ( $percentage ) {
				$output[] = '<span class="onsale product-label">-' . $percentage . '%' . '</span>';
			}else{
				$output[] = '<span class="onsale product-label">' . esc_html__( 'Sale', 'woodmart' ) . '</span>';
			}
		}
		
		if( !$product->is_in_stock() && !is_product() ){
			$output[] = '<span class="out-of-stock product-label">' . esc_html__( 'Sold out', 'woodmart' ) . '</span>';
		}

		if ( $product->is_featured() && woodmart_get_opt( 'hot_label' ) ) {
			$output[] = '<span class="featured product-label">' . esc_html__( 'Hot', 'woodmart' ) . '</span>';
		}
		
		if ( get_post_meta( get_the_ID(), '_woodmart_new_label', true ) && woodmart_get_opt( 'new_label' ) ) {
			$output[] = '<span class="new product-label">' . esc_html__( 'New', 'woodmart' ) . '</span>';
		}
		
		if ( $product_attributes ) {
			foreach ( $product_attributes as $attribute ) {
				$output[] = $attribute;
			}
		}
		
		if ( $output ) {
			echo '<div class="product-labels labels-' . woodmart_get_opt( 'label_shape' ) . '">' . implode( '', $output ) . '</div>';
		}
	}
}
add_filter( 'woocommerce_sale_flash', 'woodmart_product_label', 10 );

But how to insert vendor badges don’t know.