Frame text

I have a vertical frame at the start of my score.
I set my title and composer within document properties.
I went into the frame and clicked Add and chose Title, which correctly added the Title "Idea 1" to the frame.
I then tried to do the same with the composer "Alistair Wood" but all that happened was that the cursor flashed at the bottom right of the frame, and no text appeared.
Could someone assist? I attach the score.