Welcome to Android Central! If it's just a single message, long-press it, highlight all of the text, and then tap Copy. Then create a new note in Google Keep, Google Docs, or any other document app, and paste it there. If it's Keep or Docs, it will sync to your Google cloud, and you can then access it easily from your PC, and then print it from there.
Incidentally, I had to edit your thread title so that it didn't end with the word "print" (I changed it to "send to printer"). The forum software has this weird bug or feature where if a thread title ends with the word "print," opening the thread on the forum website only shows it in a printable format, which means no one can respond. (Just in case you were wondering why your title was edited.)