Any scripting advice is appreciated

I'm trying to learn how to click a next button or really any button besides a radio in a hit. I keep re watching all the videos but I'm stuck I have no idea what to do to get this to work. If anyone would like to help me out or point me towards the right direction I would really appreciate it.

Code:

// ==UserScript==
// @name        Botto
// @version     1
// @description Drexl
// @include     https://www.mturkcontent.com/dynamic/*
// @grant       none
// @require     https://code.jquery.com/jquery-3.1.1.min.js
// ==/UserScript==

$(document).ready(function() {
    $('[name="xx"]').focus();
    $(this).keydown(function(e) {
    if (e.keyCode == 49) {
        $('[button id="next-btn" class="btn btn-lg btn-primary"]').click();
}
});

-i see i posted this in the wrong section sry

 

Shouldn't the last line be something like this?

Code:

$('input[name="xx"][value="xx"]').click();

 

Yes I figured it out, I didn't know to use #next-btn command. Or I had my quotations wrong I cant remember. ty