Sorry if the question sounds redundant, but I have not found the WHERE to make the edits.
I have found many answers to how to do what I want
Change the Page length options
e.g.
"iDisplayLength": 500,
"aLengthMenu": [[10, 25, 50, 100,500,1000,-1], [10, 25, 50,100,500,1000, "All"]],
it's the What File should I edit that I'm having a problem with.
jquery.dataTables.js
jquery.dataTables.min.js
TablesTools.js
TablesTools.min.js