mailchimp embedded signup form submit behavior

Hi,

www.skippr.co

I need the mailchimp sign up form to take me to a confirmation page on submit, but I can't figure out why it isn't doing so. can you please help?

Best,

If it helps, this is what I'm using:

<form class="nobottommargin validate" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" action="//skippr.us13.list-manage.com/subscribe/post?u=db332c39af59e68eb102f9bbe&id=5156e0ab0b" method="post" target="_blank" novalidate>

<div id="mc_embed_signup_scroll">

<div class="col_half mc-field-group">
                                            <input type="text" id="mce-FNAME" name="FNAME" value="" class="sm-form-control border-form-control required" placeholder="First Name" />
                                        </div>
                                        <div class="col_half col_last mc-field-group">
                                            <input type="text" id="mce-LNAME" name="LNAME" value="" class="sm-form-control border-form-control required" placeholder="Last Name" />
                                        </div>

                                        <div class="clear"></div>

                                        <div class="col_half mc-field-group">
                                            <input type="email" id="mce-EMAIL" name="EMAIL" value="" class="sm-form-control border-form-control required email" placeholder="Email" />
                                        </div>

                                        <div class="col_half col_last mc-field-group">
                                            <input type="text" id="mce-LOCATION" name="LOCATION" value="" class="sm-form-control border-form-control required" placeholder="Location" />
                                        </div>

                                        <div class="clear"></div>

                                        <div class="col_one_third"></div>

                                        <div class="col_one_third center mc-field-group input_group">

                                                <h4 class="center">Platform</h4>
                                                <input id="mce-PLATFORM-0" class="radio-style" name="PLATFORM" type="radio" value="Android" checked> 
                                                <label for="mce-PLATFORM-0" class="radio-style-2-label">Android</label>
                                                  
                                                <input id="mce-PLATFORM-1" class="radio-style" name="PLATFORM" type="radio" value="iOS"> 
                                                <label for="mce-PLATFORM-1" class="radio-style-2-label">iOS</label>
                                        </div>

                                        <div class="col_one_third col_last"></div>
                                        
                                        <div id="mce-responses" class="clear">

                                            <div class="response" id="mce-error-response" style="display:none"></div>

                                            <div class="response" id="mce-success-response" style="display:none"></div>

                                        </div>    <!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->

                                        <div style="position: absolute; left: -5000px;" aria-hidden="true"><input type="text" name="b_db332c39af59e68eb102f9bbe_5156e0ab0b" tabindex="-1" value=""></div>
                                        
                                        <div class="clear"></div>
                                        
                                        <div class="col_full center">
                                            <input class="button button-light button-border button-circle t500 noleftmargin topmargin-sm" type="submit" id="mc-embedded-subscribe" name="subscribe" value="I want Skippr">
                                        </div>
                                        
                                    </div> 
								</form>