I have a question. I called USPS and they switched me over to production. Question is when I do a check out, this message displays " An error occured with the USPS shipping calculations. If you prefer to use USPS as your shipping method, please contact the store owner." I was wondering how I can resolve this error as I had registered to use the Webtools, got the username and password, and called USPS. USPS sent me an email with these two URLs and I asked the representative how or what should do with them and he said I need to add the URLs to my third party checkout, but I do not see an option where I can do so, please help, thanks.