How to add quarters with eighth notes on off beats

Jun 5, 2019

Hi,
I am new to muse score and trying to add in a 4/4 measure: 4 low quarter notes and as melody 8 high eighth notes.
After adding the 4 quarter low notes and trying to add the eighth notes above the lower note, it also change the lower note to eighth.  
Can someone share steps how to achieve that?
Thanks,
Tzahi


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