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[omng]

Help me please, how to write this type of music note

[Peter Thomsen]

There are several ways to enter triplets.
Here are two of them:

Are you using Simple Entry Tool or Speedy Entry Tool?

Both Simple and Speedy have a Tuplet (sub-)Tool.

1) In the Simple Entry Tool:
(entry via computer keyboard and entry caret)
4 (8th note sub-tool …)
Enter the first 8th
9 (… activating the Tuplet sub-Tool, and creating a triplet in 8ths …)
Enter the second 8th
Enter the third 8th

2) In the Speedy Entry Tool:
Position the crosshair on the desired scale step
Ctrl-3 (… a triplet is coming …)
4 (… entering the first 8th, and defining the triplet as 8ths …)
Enter the second 8th
Enter the third 8th

[Nick Mazuk]

In addition to what Peter said, to get the "missing beat", just enter a quarter rest and hit H to make it hidden.