Check to make sure the cards write protect is
off, take the card out of the camera, face the card towards you, look
for a small white tab on
the left hand side of the card, to unlock it push the tab down, it will
be at the side of the card like this
. Put it back in the camera and use the menu to format the card.
If the format fails then its a possibility that you will need a new card.
Good luck and thanks for choosing FixYa!!