woocommerce code for cart button
I think may be you need following code.
Add this code to your place = (**MISSING CODE TO ADD TO CART BUTTON HERE**).
global $product;echo apply_filters( 'woocommerce_loop_add_to_cart_link', sprintf( '<a href="%s" rel="nofollow" data-product_id="%s" data-product_sku="%s" class="button %s product_type_%s">%s</a>', esc_url( $product->add_to_cart_url() ), esc_attr( $product->get_id() ), esc_attr( $product->get_sku() ), $product->is_purchasable() ? 'add_to_cart_button' : '', esc_attr( $product->get_type() ), esc_html( $product->add_to_cart_text() ) ),$product );Hope this will help.