So you should be saving userSetup.py in your documents/maya/scripts folder (not the maya 2014/2015 scripts folders!). Usually, your mayatools folder is not in that same place, although you could move it there if you wished.
You need to browse to where you MayaTools folder is, not the userSetup.py file. By default, this will be in Engine\Extras\Maya_AnimationRiggingTools\MayaTools