Supply theme STOP Check-Out page to pop up when click "add to cart" button

[Azza2]

I found the way on how to change the Check-out page look, but I cannot stop that page to open every time someone click the "add to cart" button in the product.

I just want the item to ends up in the cart when someone click the "add to cart" but NO having the check out page to pop up every time.

Please help.. Thank you