trying to use phpbb integration

hi, im tryign to use the phpbb integration modification but i am kinda stuck. i know this is probably an easy question.
I am at the point where it tells me to overwrite users.php and userdb.php which are located in "modules/gallery/class" ????
i dont even see that directory at all. i have the gallery installed and it works correctly if i just go to the page that its uploaded at. I just need it integrated into my phpbb database.

here is a copy of what i am supposed to do

Included Files:
===============
- modules.php (1.4.1)
- sql_install.php (1.4.1) (delete after executing)
- modules/gallery/classes/phpbb/User.php (1.5.0)
- modules/gallery/classes/phpbb/UserDB.php (1.5.0)

1. Install Gallery as per galleries own instructions.

2. BACKUP the two phpbb class files

3. Make the necessary mysql changes by running the file "sql_install.php"
or make the changes manually as shown above.

4. Copy modified files over existing gallery files.

5. Edit files as shown in the "EDIT_PHPBB2" File
(YOU DID BACK THEM UP FIRST DIDN'T YOU!)

Ive done steps 1, 2, 3, and 5.
Tia
Joel