To edit an existing Report, click on Reports in the left-hand menu. Click on the blue Pencil icon next to the Report you'd like to edit on the right-hand side. 

Edit the information you would like to change, then hit the blue Generate Report button at the bottom. 

You'll be redirected to Reports where a new Report will be generated with the updated information.

Once your Report has finished uploading, click on it in the Report column and choose from the drop-down menu to either View, Download, Copy URL, or Share.