functions.php

// Register Custom Post Type
function custom_post_type() {
 
    $labels = array(
        'name'                => _x( 'Products', 'Post Type General Name', 'uckan' ),
    );
    $args = array(
        'label'               => __( 'product', 'uckan' ),
      // Publicize supports  
        'supports'            => array( 'title', 'editor', 'publicize', 'wpcom-markdown' ),
    );
    register_post_type( 'product', $args );
 
}
add_action( 'init', 'custom_post_type', 0 );