In Logic Pro, do one of the following:
Select an audio track, then click the Editors button tool, then click the selected regions.
Open the Audio Track Editor by doing one of the following:
Select an audio track in the Tracks area, then choose View > Show Editors.
Select an audio track in the Tracks area, then click the Editors button the Audio File Editor to make permanent (destructive) edits to the source audio file for a region.
Download the guides:
Logic Pro User Guide: PDF