QRPworks K-Board User Manual page 14

To name a message, simply enter the name as the first
characters followed by a colon ":". Everything to the left of the
colon is the message name and is not sent to the rig.
Everything to the right of the colon will be sent to the rig as text.
It's advised to keep the names short, as the space for the
characters used are shared with the characters used for the
message. The longer the name, the less room you will have for
the message.
Example: Call CQ: CQ CQ CQ de KF0UR
K-Board User Manual rev 1.6 Page 14 of 37