Can I move images saved to the internal memory to the optional xD-Picture Card

You sure can.

Go to your shooting mode menu.
Scroll down to BACKUP
Click on OK
Select YES
Click on OK
All image data stored in the internal memory is copied to the card.
Press MENU to exit the menu.

Make sure there is enough room on your card to hold all the pictures in memory.
When you've copied to the card the original pictures are still held in the internal memory so you will have to clear it.

When the card has insufficient memory, [CARD FULL] is displayed and copying is canceled.

When the battery icon is blinking, pictures cannot be backed up because of insufficient battery power.

If the battery power runs out during copying, the image data may be lost or damaged. I recommended you use the AC adapter if you have one. If not, make sure your batteries are charged.

Never open the battery compartment/card cover, remove the batteries, or connect or disconnect the AC adapter during copying as this may cause malfunction to the internal memory or the card.

go to review than click on copy to card!!

Turn the memory mode to internal - then in the review mode menu select copy then copy all to sd card