change this line:
<?php echo(str_replace("\n","<BR />",(is_array($pval)?implode(", ",$pval),$pval))); ?>
to:
<?php echo(str_replace("\n","<BR />",(is_array($pval)?implode(", ",$pval):$pval))); ?>
to get the account number, you need to sign up for an acount on the fedex.com website.
to get the meeter number, open the admin/fedex.index.php page in your browser