Bob
It looks like little by little you are making progress and getting there.
Make sure that SongBook+ is 'connected' to the keyboard.
Follow the instructions provided by Fred in the previous post:
2. Load your registration on the keyboard
3. Load your sheet music on the ipad
4. Tap the top of the screen to get the menu, press the ellipsis, tap Now link the song.
Repeat steps 2 through 4 for each registration you have.
Basically, you need to have both open at same time, the registration on the keyboard and the PDF on the ipad and then do the linking. Make sure you do not press any button on the registration until after the linking. The Songbook will then link the PDF present to the keyboard registration present.
Hope this helps.
thanks