[Plugin: PrestaShop Integration] Help configuring the plugin

i need to configure the plugin, i configure the path of my prestashop in my local server instalation “http://127.0.0.1/prestashop/” and nothing hapends

add the [ps_product_list id_category=4] to my page, but remain blank.

my wordpress instalation path is http://127.0.0.1/wordpress/

What should I do?

http://ww.wp.xz.cn/extend/plugins/prestashop-integration/