thats easy, Home is the home folder... just click the house on the toolbar then make the hidden files visible by clicking "view" show hidden files..... then go to the folder they say(HOME/.mplayer/mplayerplug-in.conf) open the config file and add the code they say and save... give it a try :)
Don't forget the preliminaries, from your link.
1. Install the lates wine,
2. Download and install firefox windows version
3. On firefox download the extension MediaPlayerConnectivity
https://addons.mozilla.org/extension...nfo.php?id=446
4. Go to the Macromedia site and install flash
5. Using your favorite editor, make file mplayer.exe and cut and paste this to it
#!/bin/bash
/usr/bin/mplayer -really-quiet -nojoystick -nofs -zoom -vo xv,x11 -ao esd,alsa,oss,arts,null -osdlevel 0 $1 </dev/null