Thanks very much inebriate. For anyone interested, I found this code in cart.php:
#
# Redirect
#
if ($config["General"]["redirect_to_cart"] == "Y") {
if (!empty($active_modules["SnS_connector"]))
$is_sns_action['AddToCart'][] = $productid;
func_header_location("cart.php");
And changed the "cart.php" to the page I want it to go to. Then I enabled "Redirect Customer to Cart" in the general settings of admin.
