Changing number of products displayed on page in WooCommerce (WordPress)

1. Install WooCommerce plugin in your wordpress

2. Install WooCommerce Product Archive Customiser plugin
     use :http://wordpress.org/plugins/woocommerce-product-archive-customiser/

3. Then go to WooCommerce (menu) => Products(tab) => Product Archives

4. Change and save above settings (Product Archives)