Checkout Workflow Issues

I would like to remove the registration/login feature on my checkout screen. I went to the checkout workflow and removed some of the fields to where it just now shows "payment_confirm_coupon_cart_status_fields,end".
I can get it to "Add to Cart", but when you hit "next" it does nothing. I need to get this working, any ideas?
The shop is at: hpsfl.org/index.php?option=com_hikashop&...product&task=listing

Thanks

I figured out I needed to upgrade, which I did.
Now I'm getting the following error: The following errors have occurred.

(123) This account has not been given the permission(s) required for this request.

Any idea how to fix?
Thanks

Hi,

Your error is a Authorize.net error, not an HikaShop one.
Please check the configuration of your authorize payment plugin.

Regards,

For others knowledge, it was the transaction ID.