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1. gain shell access to the device, which is described here: http://buffalo.nas-central.org/index.php/Open_Stock_Firmware
2. RSDM is php based therefor we need a webserver. in order to install one a package manager comes in handy, this is being described here: http://buffalo.nas-central.org/wiki/Ipkg_on_the_Linkstation_(for_end-users)
3. the packages you need: apache and php-apache, install them with:

   ipkg install apache

   (and php-apache likewise)

4. if you just gained shell access your NAS will have a webserver installed already for a configuration UI, you can either disable that server, or use a different port. The latter one can be achieved through a

   Listen 5000

   in the server configuration

   /opt/etc/apache2/httpd.conf

5. in the same config file there is the

   DocumentRoot

   defined, this is where you should unzip your RSDM files

6. furthermore you have to add two addtional lines:

   LoadModule php5_module libexec/libphp5.so

   AddType application/x-httpd-php .php .phtml

did the configuration some time ago, I hope I didn’t forget anything. After configuring don’t forget to restart your webserver with

/opt/sbin/httpd -k restart

After that open the URL

http://NAS_IP:NAS_PORT/RSDM_PATH

where you have to adopt NAS_IP, NAS_PORT and RSDM_PATH, the last being relativ to the above defined DocumentRoot.