If I may……..
Open your emailpetition.php
Lines 75 – 85
Find below…__(‘First Name’,’dk_speakup’)….
<label for=”dk-speakup-first-name-‘ . $petition->id . ‘” class=”required”>’ . __( ‘First Name’, ‘dk_speakup’ ) . ‘</label>
If you don’t have ‘First Name’ enter it…this is what titles your rows.
Do the same for ‘Last Name’ and ‘Email’
Hope that helps!