You need to copy the list item function from the theme-base and copy it to your current theme.
Theme-base file location: qa\qa-include\qa-theme-base.php
Your theme file location: qa\qa-theme\SnowFlat\qa-theme.php
The function you need to copy:
public function q_list_item($q_item)
{
$this->output('<div class="qa-q-list-item' . rtrim(' ' . @$q_item['classes']) . '" ' . @$q_item['tags'] . '>');
$this->q_item_stats($q_item);
$this->q_item_main($q_item);
$this->q_item_clear();
// ADD YOUR BUTTONS HERE
$this->output('</div> <!-- END qa-q-list-item -->', '');
}