To use the same phpMyAdmin installation to service several MySQL servers edit the config.inc.php file and add the following lines – don't forget the $i++ line:
$i++;
$cfg['Servers'][$i]['auth_type'] = 'cookie';
$cfg['Servers'][$i]['host'] = 'mysql.server.com';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['compress'] = false;
$cfg['Servers'][$i]['extension'] = 'mysql';
