in your phpmyadmin files make sure you have updated the config.inc.php file correctly:
Open config.inc.php, then search for $cfg['PmaAbsoluteUri'] and type under this address:
$cfg['PmaAbsoluteUri'] = 'http://localhost/phpmyadmin/';
Port number would be 3306, and password what you specified, i.e. a little further down or (or just search for):
$cfg['Servers'][$i]['port'] = '3306';
and further down:
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = 'YOUR PASSWORD';
Also make sure your phpmyadmin files are inside the doc_root set for the webserver.
Hopefully this helps!