well
I have got this.
You have to copy ps2vfs.jar and folder "lib" where you want but where you copy that files that is the path where the ps2 look for your things, do you understand me? I run ps2vfs in my pc ( It need java runtime) and I can see a window with a few of options.Then I go to my ps2 and I load ps2media player from cd, when it load I write my local configuration and I click in launch. Then I go to navigator and It appeare the files that they are in the same path that ps2vfs.
I hope that you understand me.
The firewall can be activated.