From the Contacts tab, tap Menu (located in the lower left).
Tap Share namecard via.
Ensure the desired contacts are selected (checked) then tap Done (located in the upper-right).
If presented with a "Turn on Bluetooth?" screen, tap TURN ON.
Tap a device.
To appear in the Bluetooth devices list, the recipient's device must be discoverable.
If necessary, tap Scan (located at the bottom).
To complete the transfer, the recipient must accept the file.