This heavily depends on the theme you're using. Edit file qa-theme/<your-theme>/qa-theme.php
If you aren't already overriding the footer function in your theme then adding this to the file will do:
function footer() {
$this->output('<div class="qa-footer">');
if (qa_request() === '') {
$this->output(
'<div>',
'A div with content',
'</div>'
);
}
$this->nav('footer');
$this->attribution();
$this->footer_clear();
$this->output('</div> <!-- END qa-footer -->', '');
}
If you are using the Snow theme released with Q2A 1.6.3 you should make your already existing body_suffix function look like this, as it is already being overriden by the theme:
function body_suffix() {
$this->output('<div class="qa-footer-bottom-group">');
if (qa_request() === '') {
$this->output(
'<div>',
'A div with content',
'</div>'
);
}
qa_html_theme_base::footer();
$this->output('</div> <!-- END footer-bottom-group -->', '');
}
Other themes might/will require a different solution.