Changing the number of repeats

Hi - I'm trying to change to text of a repeat line - in the "Prima Volta". I've managed to make MuseScore play the correct number of repeats but I want the volta to actually say 1&2 - not just one.
I can't see a way of amending the text. I'm sure there's a way but I can't see it!
Thanks for any help.
Chris L-D