Click Audio icon on the main interface of the software after you launch it. After the file is loaded into the software, there are 2 ways to enter into the Edit window:
1) Click the Edit button on the right side of the file thumbnail.
2) Click Edit > Trimming on the top menu bar.
Click the Trim button to add a pair of sliders. Drag the two sliders, and the part between the sliders is what you want. You can also type digits in the Start Time text box and the End Time text box to define it.
This application supports trimming multiple clips, so you can trim several parts from one file at a time. Drag the play slider and then click the Trim button to add more trimming sliders and define the part you want. Click the Play all trimmed sections button to preview the trimmed parts. The Start Time and End Time show the time point of current pair of trim sliders. You can click the Trash bin icon to remove current sliders.
If you want to remove all the sliders, click Reset. If you complete the settings, click Done button to save them.