Hi, I'm having difficulty understanding your description of just what you are trying to do.
I'm thinking you're referring to the free Audacity Audio Editor?:
If you have Audacity installed on the computer where the .WAV file is, no exporting or uploading should be needed - from the file menu in Audacity you can find the .WAV file and load it into Audacity to be edited. Note that you can't restore quality to sound if it was never recorded there in the first place, but the enhancement tools in software like Audacity can often improve how it sounds quite noticeably.