I want to know how to modify the subscription code so that the checkbox in the subscribe form is automatically “checked” behind the scenes, but the checkbox isn’t visible to viewers.
<div class="tnp tnp-subscription">
<form method="post" action="http://baseinstall.nimblesplash.com/?na=s" onsubmit="return newsletter_check(this)">
<div class="tnp-field tnp-field-firstname"><label>Name</label><input class="tnp-firstname" type="text" name="nn" required></div>
<div class="tnp-field tnp-field-email"><label>Email</label><input class="tnp-email" type="email" name="ne" required></div>
<div class="tnp-lists"><div class="tnp-field tnp-field-list"><label><input class="tnp-preference" type="checkbox" name="nl[]" value="1"/> Default List</label></div></div><div class="tnp-field tnp-field-button"><input class="tnp-submit" type="submit" value="Subscribe">
</div>
</form>
</div>