Randomizing Edge Theme Posts

so I wish to upgrade to the newest version of edge but I can’t seem to find where to place my custom isotope main.mini.js file…this file makes it so my posts are in a random order every time you visit my site

I tried going to assets → js and replacing the main.js file but that didn’t work

I’m thinking I might be able to just tweak the new edge themes main.js file at line 42?

function feed() {
‘use strict’;
var grid = $(’.post-feed’).masonry({

@minimaluminium am I on the right path?