template.register.php

<div class="sixcol column">
    <div class="field-wrapper">
        <input type="text" name="first_name" placeholder="First Name" />
    </div>
</div>


<div class="sixcol column last">
    <div class="field-wrapper">
        <input type="text" name="last_name" placeholder="Last Name" />
    </div>
</div>