Different Duration Notes Together

I'm currently trying to create sheet music for a piano song, in one part of the song the third and fifth fingers of the right hand are playing half notes while the first finger is simultaneously playing eighth notes (the number of eighth notes are equivalent in duration to the duration of the half notes). I can't quite figure out how to get this written using Musescore but I am fairly new to using it. Any advice on how to get this in my sheet music would be greatly appreciated, thank you!