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I am bit new to Linux/mySQL/phpMyAdmin myself, so when I first setup phpMyAdmin I used my root account as well (providing you followed the above example verbatium).
However you may want to create a new db user for phpMyAdmin to authenticate with, I beleive it's a bit insecure to use the root account for this.
Also throw a htaccess file in your phpMyAdmin directory that way if anyone guesses it's path they won't be able to get to it without proper authentication.
Just my two cents.