MARIA IOANNOU

When I will transfer the program to another computer, I will need to have a password or an email address, to secure that the data will be safe?

I deleted a receipt, which was the last receipt on the payment list. When i applied for a new one, the system changed the number of the receipt, and did not gave the previous one that was deleted. Now i have a trouble, cause the payment list shows that a receipt number is missing. Why that happens and how i am able to correct this?