Click button on page load with JS

I have a single accordion that I want open on page load

I am trying to click the accordion on page load but not getting it, its the Subscribe button at the bottom of the browser
http://aaa.greaterthanthesum.com/

I have tried all the selectors I could find but none of the have worked

$(document).ready(function () {
    $(".pp-er.pp-er-588cf9977df09.pp-er-open").click();
});

Any help is appreciated
Thanks