How to install the attachment mod on phpbb forums

[Quad Master]

Hi Guys

I cant figure out how to install mods for phpbb.

This is the first time i am trying to figure out how to install mods on a forums

I want attachment facility on the phpbb forum so found this.

Attachment Mod
- http://www.opentools.de/board/viewtopic.php?t=262&page=4&sid=1f10f1a01454a5a71ddd8befac711c52
- http://www.phpbb.com/phpBB/viewtopic.php?t=74505
- http://www.opentools.de/docs/user_guide.html#introduction [Guide]

Please help me to provide attachment facility on the phpbb forum.

I want to install the above attachment mod how do install it
A step by step guide wud help.