there is nothing named "directory" a directory and a folder are the same thing.
when you download phpbb from here and unzip it you have one directory named phpBB3. inside that main directory are several other directories and a bunch of files.
inside each of those directories are several other directories and files, etc. etc.
now, the instructions tell you to remove the file named config.php, the directories named files, store and images.
that is, the directory named files, the directory named store and the directory named images.
I hope that is easier to understand now.
then, you upload all the rest of the directories and files to your server.
then, in your browser you go to : yourdomain.com/yourphpbb/install/database_update.php
that file will update the database. it will show you a message at the bottom of the page when it is finished.
then you go back and delete that directory named install.
you are done.
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Premium phpBB 3.2 Styles
OK, so what's the speed of dark?