Your camera supports an SD card. SD cards have a tiny switch that can be used to write-protect the card.
Make sure that the card memory is not full. If you are certain that the card is locked try to locate the tiny switch and move it to the 'unlock' position.
The following diagrams may assist you in finding the location of the switch:
Card Switch in Downward "Locked" Position (note the arrow by the word "Lock")
Card Switch in Up "Unlocked" Position
If you have tried this, and it is still showing locked, it is likely that
the locking switch inside the camera's card slot is stuck. If you look
inside the slot on the side of the slot where the SD card slide switch
would be, you will see a glint of gold color on the side. This is the
camera's lock/unlock switch. The other glints of gold that you may see
at the far end of the slot are the reader's connectors (ignore those).
Camera's SD Card Lock/Unlock Switch
Somehow, the locking switch is making contact and has become stuck in
the locked position (a single grain of sand can jam it there). With a
plastic toothpick, or other skinny NON-METALLIC item, tap and gently
push against this switch to see if you can jar open the contact to its
normal unlocked position. Also try blowing compressed air at it, to
clear out any gunk that may have worked its way in there, jamming it
closed. Occasionally, reinsert the SD card to see if the issue has been
corrected.
If repeated tries fail, it may be time to consider
opening the camera to force open this switch (not recommended unless
you have some familiarity with electronics).
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