Yaesu FTM-400DR Operating Manual page 126

Sending and Receiving Messages and Pictures
7
Touch [ENT]
The entered characters will be set and the display
will return to the screen for confirming the message
contents.
8
Touch [SEND]
Message transmission will start and the icon on the
left side of the address will blink. The sending and
receiving indicator at the top left of the screen will
also change to red.
"Completed" will be displayed when the message
is completed. The display will then return to the
message list screen. The tag of the sent message
will be added to the top of the list.
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