After you installed phpMyAdmin, you logged into your phpMyAdmin for the first time and see the following error at the bottom:

The configuration file now needs a secret passphrase (blowfish_secret)

To correct this error, you need to add a blowfish secret to the phpMyAdmin’s config file

Step 1: Open phpmyadmin/config.inc.php

Step 2: Find:

$cfg['blowfish_secret'] = ''; /* YOU MUST FILL IN THIS FOR COOKIE AUTH! */

Step 3: Add your blowfish secret, it should look like this

$cfg['blowfish_secret'] = 'jdksheuhekhsuhkeuhkdhk'; /* YOU MUST FILL IN THIS FOR COOKIE AUTH! */

Now, you can log into phpMyAdmin, that error should be gone.