Click "add to cart",Nothing change

i intall the “WordPress Simple Paypal Shopping Cart” at first at https://www.dvdmoviefilm.com/daikuan/ (this can seems as another site),i just use it to try the plugin.I try the function of plugin at this page:https://www.dvdmoviefilm.com/daikuan/车辆抵押贷款/,But later when i click the “add to cart” at https://www.dvdmoviefilm.com/who-we-are/our-service/,All the order had auto go to https://www.dvdmoviefilm.com/daikuan/车辆抵押贷款/

i do not know why cause so.So please help me,Thank you

I can’t see a shopping cart shortcode on your post or page. Have you entered a shopping cart shortocode on that page?

Check step 2 from the following shopping cart plugin usage documentation:
https://www.tipsandtricks-hq.com/ecommerce/simple-wp-shopping-cart-installation-usage-290

Thanks ,i think for me forgot to add the [show_wp_shopping_cart]

Thanks so much for help.