Hello Mary, and thank you for choosing JUSTANSWER.com
Because Norton does NOT recognize JOINT accounts. What you need to do......is get your OWN norton account.
To do this.....you will need to UN-install the Norton that is currently on your computer.....and then Purchase your OWN copy of Norton, and register it with YOUR email address.
This can be tricky, and it can be easy to mess up, as you are working with 2 accounts.
Unfortunately, Norton does not allow the TRANSFER of accounts to a different name. Norton requires that you create your OWN account.
I think the best way to help you is with a REMOTE session, and allow me to connect to your computer, to make the changes, and help you get setup correctly.
Are you up for it?