Well, I might be able to help you if you know how to code. I modified this page, nm-mc-form.php with the code below. You have to view the source code first through Chrome to get the id’s and just substitute that value like I did below. Hope this helps you out.
<form id="nm_mc_form_<?php echo $widget_id?>" onsubmit="return postToMailChimp(this)">
<input type="hidden" value="<?php echo $fid?>" name="nm_mc_form_id" />
<input type="text" name="FNAME" id="FNAME-1364853424" value="First Name" class="nm_mc_input" /><input type="text" name="LNAME" id="LNAME-1364853424" value="Last Name" class="nm_mc_input" />
<input type="text" name="EMAIL" id="EMAIL-1364853424" class="nm_mc_input" value="Email" data-required="1" />
