Many thanks for replies to my post earlier in the week. I’m getting there…!
Having used Sibelius since about 1996 on the school’s Archimedes computers, it’s ingrained into my being, but starting to adapt nicely.
I can’t for the life of me, though, work out how to add to notes in one voice at the same time. For example, I want a middle C plus an E natural a third above, sounding at the same time. In Sibelius, it would have been as simple as selecting the C then (I think) clicking shift-E and the extra note would go in above.