I can ignore that part of the manual ? Everything seems fine ... I might have problems in the future? I do not quite understand the manual because I'm using the Google translator ...

Copy the file "cd.png", located in /components/com_muscol/ to the "formats" folder you just created in the "images" directory
Go to Music Collection administor area and click on "Parameters" icon to set up basic configuration for the component. Be sure to do that before you start working with Music Collection
Install and enable the plugin JWPLAYER, included in the downloadable zip file, and also downloadable from the downloads area for free. It's called plg_jwplayer_XXX.zip
The rest of the modules are optional. You can install them all, none, or some...
...you're DONE!

This I can not understand

Copy the file "cd.png", located in /components/com_muscol/ to the "formats" folder you just created in the "images" directory

I do not know how to make the index equal to demo (Music Collection Demo)

http://5teste.meuboy.com/novo2/index.php/music

Thanks