About setting up the config.inc.php, the official phpMyAdmin docs says
$cfg['blowfish_secret'] = 'theExampleWrites16ValuesHere'; // use here a value of your choice
What is a blowfish secret? How do I generate, or choose, a value?
Simply use any random string of characters and/or numbers that you like. It is a value that will be unique to your instance and use of phpMyAdmin.