How do I delete picture from fujifilm camera A340?

You need to update the firmware. It's available her:
http://www.fujifilm.com/support/digital_cameras/software/firmware/a/finepix_a340/fupd.html

Use fresh batteries for the update.

you need to use regular batts, then change the setting to rechargable

You need to clean some space to your card by uploading the pics to a computer or deleting them from the card. Or you can buy a new card.

Try the fuji website :-

http://www.fujifilm.co.uk/consumer/digital/digital-cameras/legacy-cameras/finepix-a340-zoom/support

Yes, if you update the firmware to ver. 1.22
http://www.fujifilm.com/products/digital/download/a340/fupd.html
You may have to use an AC adaptor for this operation.

Ja jestem za pomocą Google Narzędzia językowe do tłumaczenia. Mam nadzieję, że nie jest zbyt dużo straconych w tłumaczeniu.

Wytrzyj kontakt obszaru na xD-Picture
Karta z miękką, suchą szmatką. Może być
konieczne sformatowanie xD-Picture Card.
Jeśli komunikat o błędzie jest nadal wyświetlany,
zastąpić xD-Picture Card.
Jeśli nadal masz problem, skontaktuj się z dealerem FUJIFILM.

Mam nadzieję, że ten problem został rozwiązany dla Ciebie.
Z poważaniem, CBR2009

turn the power on from the back. do not open shutter. press middle button menu/ok. the first selection to come up is the erase option framed in orange. there will be a trash can at the bottom. then use the button in between the zoom buttons to highlight the frames or all frames option then press ok. that should do it for you.

in playback mode, press menu and navigate left or right to the erase menu. Scroll down to delete frame for 1 image deleting, or to erase all to remove all images.

Be sure you have formatted the card, not the internal memory (if the camera has that).
Be sure your battery is fully charged, so that the device can fuly write the file.
Be sure you are writing the file to the card, and not the internal memory, as there may not be enough space on it to write the file.
If this does not resolve the problem, let me know.

If your new xD card is an "H" or "M" type card, it is only compatable with the A340 following a firmware upgrade to the camera. http://www.fujifilm.ca/x3721.xml is a link to the software and steps you can take to perform the upgrade.