That works fine, k_b, but entering cues was never the problem; the problem was not being able to edit the cue properties after they were in. I couldn’t get the Properties Panel to appear, because clicking on the cue notes didn’t result in anything.
However, PianoLeo, you nailed it—I had to click on the cue instrument name, not the notes themselves. The Properties Panel immediately appeared, and I was good to go.
Thanks much to both of you.