I know this is going to be a simple one but due to a less than helpful index in my book I studying, I can't find the answer. So, I need to tell PHP that I don't want to close the string, just add a ' in the middle of it. See below:
header( 'refresh: 3; url=member.php' );
echo '<h2><center>You have been validated. Sit tight, we're redirecting you. . .</center></h2>';