How do I add two lines to a single note?

Hello. I'm not an expert with Musescore and I'm having a problem that is stumping me. I'm trying to add a half note that is played on two strings on the violin at once, and it is the same note. So I'd like the note to have one note line (terminology?) going up and one going down on the same note. Any idea how to accomplish this? Many, many thanks in advance. I've uploaded a picture of what I'm trying to get.