Replacing V7.5.2 with LMS 7.7.2 on QNAP TS-209

Can anyone point me to or give a step by step guide on how to do this (I'm not a linux guru).

My set-up is as follows:

QNAP Ts-209 with Current firmware version: 3.3.0 Build 0924T

Squuezebox Server Details
Version: 7.5.2 - r31632 @ Mon Dec 13 14:07:29 MST 2010
Hostname: MACCS001
Server IP Address: 192.168.1.102
Server HTTP Port Number: 9001
Operating system: Linux - EN - utf8
Platform Architecture: armv5tel-linux
Perl Version: 5.10.0 - armv5tel-linux-thread-multi
MySQL Version: 5.0.27

Thanks very much for helping me.