I received a gift from a friend from walmart. It is a visa walmart debit card. I tried to use it at walmart but was told that i needed a pin number. I do not have this. I called the number to check on what to do and was told that I needed to activate the card and to do this I needed a transaction number that is on the receipt. It did not purchase this card as it was a gift. So please tell me how do I use this card.