Here's another try Eveline, with edits and editorial comments in red.
- A melisma is the vocal technique in which a single syllable is sung over two or more notes. The notation of a melisma is indicated with an extender lineâ€”an underscore that extends from the syllable to the last note to which it is sung. This applies whether the syllable is a single-syllable word or the last syllable of a multi-syllable word.
It is not uncommon to refer to the extender line itself as a melisma, which is a little bit like referring to a calendar as time itself. Encore's User Manual uses the term "melisma extender line". Though verbose it nicely couples the vocal technique with the notational convention, without misusing the term melisma.
Entering a melisma
To enter a melisma extender line, type as many spaces as needed to advance to the last note involved. Then type underscore ([shift]+[hyphen]). This last step completes the entry of the melisma, but it will not immediately appear. It will appear when we exit Lyrics mode, which we can do by selecting the Arrow tool or pressing [escape].