Further explination
Here is what I am seeing, I purchase a product from the store using my sandbox personal buyers id associated with one of my emails addresses, (I have check the generated password from paypal to see if it works which it does) I got to check out user the email address do the purchase try to use the sand box password and I get the following screen which I have captured it will not accept the paypal generated password. It would be very helpful if we could have a video instruction on how to use the sand box since the paypal instruction is not very good. I do have one other question under instructions of accept billing agreement scroll down to step three Set up your ppayment action I did not find that could you explain more please.