Thank you André!

That's the help I needed and the code worked fine ( no typos I guess lol)
To help others who may appreciate this, I inserted the code you provided: "$email = mysql_result(cpg_db_query("SELECT user_email FROM {$CONFIG['TABLE_USERS']} WHERE user_name = '{$row['user_name']}' LIMIT 1"), 0);"
before "$template_vars = array( " in the file register.php which is located in the root directory which only had to be done in two locations as shown below.
The code inserted on (my line 759) enabled the variable "EMAIL" to be displayed correctly in the user's "Activation notification" email.
(755) //after admin approves, user receives email notification
(756) if ($user_status == 'active_admin') {
(757)
(758) msg_box($lang_register_php['information'], $lang_register_php['acct_active_admin_activation'], $lang_common['continue'], 'index.php');
(759)$email = mysql_result(cpg_db_query("SELECT user_email FROM {$CONFIG['TABLE_USERS']} WHERE user_name = '{$row['user_name']}' LIMIT 1"), 0);
(760) $template_vars = array(
(761) '{SITE_LINK}' => $CONFIG['site_url'],
(762) '{USER_NAME}' => $row['user_name'],
(763) '{SITE_NAME}' => $CONFIG['gallery_name'],
(764) '{EMAIL}' => $email,
(765)
(766) );
The code inserted on (my line 799) enabled the variable "EMAIL" to be displayed correctly in the administrator's "Registration request" email.
(798) $act_link = rtrim($CONFIG['site_url'], '/') . '/register.php?activate=' . $act_key;
(799)$email = mysql_result(cpg_db_query("SELECT user_email FROM {$CONFIG['TABLE_USERS']} WHERE user_name = '{$row['user_name']}' LIMIT 1"), 0);
(800) $template_vars = array(
(801) '{SITE_NAME}' => $CONFIG['gallery_name'],
(802) '{USER_NAME}' => $row['user_name'],
(803) '{ACT_LINK}' => $act_link,
(804) '{EMAIL}' => $email
(805) );
Thanks again for your assistance and please mark this as SOLVED!
Mac