Different length for notes in same bar

Hello there!
I am notating a sheet music I have in Musescore, so I can have it as PDF. Anyway, the in some bars, the first note is a quarter note and the second note is a half note, unfortunately I can't notate it in Musescore. Check the images!

The first image: what the sheet music looks like
The secind image: what I get in Musescore

How can I notate that in Musescore??
Thanks in advance!