In your theme file qa-theme.php check if there is a function head_metas() if there is than add only below line in that
$this->output('add your meta tag here');
Otherwise add this entire function
function head_metas()
{
qa_html_theme_base::head_metas();
$this->output('add your meta tag here');
}
This is only for meta tags and other tags you should add to appropriate class method.
Updated Code
Multiple Meta tags
function head_metas()
{
qa_html_theme_base::head_metas();
$this->output('<meta ..... >');
$this->output('<meta ..... >');
$this->output('<meta ..... >');
}
You also can use comma in one output but to keep it easy just add new output for each meta as above.
Why you need title tag? It will be generated automatically.. You do not need to add it.