Okay, thanks for the reply
I’ve read the tutorial and it’s not much different with what I’ve done. I’ve installed this plugin in localhost’s default wordpress and it works splendidly. But the problem is, when I implement in my client’s website, the button (or the cart) didn’t work.
When I click an “add to cart” button in localhost, it didn’t need to refresh the page. But in my client’s page it did. And after I clicked it, the items won’t shown in the shopping cart (it always say that the shopping cart is empty)