I am having a terrible time trying to remove some unwanted stuff at beginning and end of audio.  I am following the steps in the video on YouTube about how to cut unwanted parts.  I load the file, click at the start of what I want to delete and move cursor to the end of the part to be cut.  The "shade" comes over the section to be cut.  I click on edit, but "delete" is greyed out so I can't remove the unwanted part.  It worked once after several tries,  but hasn't worked again
Am I doing something wrong?  Is there something else I should  be doing?