Click on Configuration the left hand side of the screen.
Click on Product settings and then Manage Variation Sets.
Click on the icon of the pen and paper.
After you have edited the information press "Update".
If the fields was filled in correctly, congratulations you have successfully edited a Attribute set. If there is something wrong, an error message will appear and it will say if the field was filled out incorrectly and you might need to make a adjustment to it.