Lyrics in a score

In writing lyrics for a choral group with MuseScore, how do you create an underline at the end of a word that ties to the end ofa group of tied notes? I did it once but cannot figure out how I actually did it and can't find any documentation or palette tool that will let me create a word like this, where the end of the word is indicated to hold until the end of the tied group of notes.

To - geth - er.______

Thank you in advance for any info you can provide. Or even a clue as to where I could look for the answer.

Best regards,

Steven Kacsmar