From the manual:
Re: #3 - What, precisely, do you enter for (for example) the 1st ending?
I have a measure where I’d like to create a 1st ending:
When I press Shift-R, I get the Repeat Ending popover. Intuitively, I type “1” (without quotes) for the 1srt ending. Result:
What am I doing wrong? And where might I find more specific directions for this in the manual?
Exactly what the instructions suggest that you enter: end or ending.

There’s also a comprehensive popover guide you can download from https://www.steinberg.help/v/u/dorico_6_1_popover_reference_en.pdf
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I have passed on this feedback about the distinction between text marked up as being “text that you should write into the popover” vs plain text to my colleagues, for consideration.
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