On Sirius Satellite Radio, how do you scroll to the right? (read details)?

My mom has Sirius Satellite Radio in her car. When it's playing, if you press a certain button (labeled INFO) it tells you first the artist and then if you press it again, it tells you the name of the song (or maybe it's vice versa, not sure.) The problem is, if the name of the song or artist is too long for the screen, it puts a "..." on the end. We can't for the life of us figure out how to scroll to see the rest! It's quite frustrating when you see, as an artist, "THE RED J..." You just sit there wondering "the red what?" (Jumpsuit Apparatus)

Anyway, help!
Thanks.
Sophia