Disklavier

I need help with my Yamaha Mark II XG Upright Piano. Actually, I have
several problems understanding the manual, it almost seems like it was
written in Japanese, and then translated to English. Perhaps someone
could recommend an email or phone number for Yamaha tech support. 

Anyway, here's my question. I want to add a title to a song on the
Memory Disk, which currently defaults to PIANO006.mid. The manual
states, "Select song No. 1, then press the [SONG SELECT ] button again
to display the disk title."

Because I have multiple songs on the Memory Disk, when I press the
SONG SELECT button, the disk title does NOT appear, it merely switches
to another song. So, how do I display the disk Title, in order to
change it, on a multiple song Memory Disk? What am I missing?