You are posting in the Mac editor forum, so I presume you have the Mac editor?
Information is here: http://irealbook.net/iReal_Book/Mac_Editor.html
You should be able to print from the Mac editor, assuming your printer is already set up to print from the Mac. (You would send the song via email to yourself (Choose "To other iPhone/iPod"), and pick it up on the Mac email, click on the song and it should appear in the Mac Editor ready for printing.)
It appears that certain type of edits, e.g., insert text, disables the printing function. If you close (& save) then reopen the file you are able to print.
It appears that certain type of edits, e.g., insert text, disables the printing function. If you close (& save) then reopen the file you are able to print.
How are you printing then? directly from the iPhone/iPod touch, or from Mac editor or from Web editor?
From iReal book you could send the song as a printable image (makes it a jpeg.)