Camera keeps saying "card locked"

Hi,

Remove the memory card and you will find a switch on the left side of the card. It must be locked, so slide or push the lock on other side to open it and then insert the card back to the Camera.

Once the card is unlocked, you can delete the photos.
Regards
Ron

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Look at your memory card. SD cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.