Tom,
The User Guide helps: Section 7.2 in particular says:
" 7.2. Free-Text Messages
Users often add some friendly chit-chat at the end of a QSO. Free-format messages such as “TNX ROBERT 73” or “5W VERT 73 GL” are supported, up to a maximum of 13 characters, including spaces. In general you should avoid the character / in free-text messages, as the program may then try to interpret your construction as part of a compound callsign. It should be obvious that the JT4, JT9, and JT65 protocols are not designed or well suited for extensive conversations or rag-chewing."
Your message exceeds the 13 character limit!
My suggestion would be to simply stay on the same transmit frequency and send the summit reference without your callsign, as can be seen in the screen shot sent above from Roger F5LKW. The person at the other end should be able to see your message and put it all together.
Good luck!
Peter VK3PF