You can create regions in powercms and place the code in the title tag and meta tags. Here is an example:
<title><?php echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'Resources' , 'meta-title'); ?></title>
<meta name="description" content="<?php echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'Resources' , 'meta-description'); ?>" />
<meta name="keywords" content="<?php echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'Resources' , 'meta-keywords'); ?>" />