Tap [User Box].
Tap [System] - [Annotation].
Select the desired User Box, then tap [Open].
If the box is password protected, tap [Open] and enter the password.
You can also open the desired User Box by tapping it twice.
Select the desired file, then tap [Send].
Specify the destination.
For the destination setup, refer to Here.
Set the file send options if necessary.
Press the Start key.
Transmission begins.