Instructions: https://d.pr/i/qjmUd9
To open the console, right-click anywhere on page, select "Inspect". From the menu that appears (usually on the right, but might as well show up at bottom/left of the page), select the "Console" tab. Insert the script here. Press "Enter". Refresh the page.
It will show the variation you selected from the script
function setCookie(name,value,days) {
var expires = "";
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days*24*60*60*1000));
expires = "; expires=" + date.toUTCString();
}
document.cookie = name + "=" + (value || "") + expires + "; path=/";
}
var pageID = window.__page_id;
var desiredVariation = "A"; // Replace "A" with the variation you want to force load
setCookie('instapage-variant-' + pageID, desiredVariation, 1);