Use the 'Markers Position' to add a marker point or selection. To add a marker point, left-click on the waveform image and click the 'Add' button.
To add a marker selection, left-click on the waveform image then drag your mouse to the point where your selection end. The section will be highlighted as shown below. Now just click the 'Add' button to add that marker selection.
You can use the 'Delete' button to delete an exisiting marker.
Waveform Image
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