In the bin, right-click the file and SAVE AUDIO CLIP AS NEW FILE. It should land in the Music folder on your PC. But that can be changed in OPTIONS | DISK | CAPTURED AUDIO.
A clip on the timeline is easy to edit in WavePad. Right-click the audio track and EDIT IN WAVEPAD.
Make the changes there, then click APPLY. Close with the red X at the top right and SAVE.
The revised file will replace the clip on the timeline and the bin, but the original file in the PC folder will be unchanged.
Make a mistake? Press <ctrl-Z> to step back, change-by-change.