How can I add a small bit of staff and music (singer range indication) to the instruction page?
Welcome to the forum, Dan. Probably the easiest way is to create a new flow and assign just the singer(s) to that flow, then create a layout-specific music frame on the instruction page and assign that flow to that page. You don’t need to create any meter in the new flow and can set on the Barlines page of Notation Options that it shouldn’t show any barlines, etc.
This is a reasonably advanced topic for a brand new Dorico user (apologies if I am incorrectly assuming that you’re a new user) but this video series should help you.
I am a new user and thank you very much for your response