Please open “config.inc.php” file which one is located in “wampappsphpmyadmin” directory.
After that add/update below lines:
$cfg['Servers'][$i]['auth_type'] = 'config'; //change authentication type "cookies" to "config"
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = '';
$cfg['Servers'][$i]['AllowNoPassword'] = TRUE;
$cfg['Servers'][$i]['AllowRoot'] = TRUE;