Where is the the PageComments .ss file stored? I want to add a class to the PageComments_holder div and cannot find it anywhere. Thanks!
You will find the PageComments_holder Div here: <yoursite>/cms/templates/PageCommentInterface.ss
But note you shouldn't edit the file in this location. You should copy the files you want to edit (in this case cms/templates/PageCommentInterface.ss) to themes/yourtheme/templates/ and edit the copied file. This will mean if you upgrade SS you won't lose your changes and it keeps all your templates together.