Thank you Nelson that seem to work for me.
Now for anyone else who doesn't understand how to install the instruments, here are the steps as I see them:
1: Instally the Pyano program first
2: create a folder called "pyano" on the external memory card
3: download the extra instruments (drums and flute) to the (pyano folder) on your exteral memory card
4: Start the Pyano program from the extra's directory
5: from the menu in the Pyano Program choose "Install Instrument"
6: click on the "second" ( ./ ) change dir, 6 times or until you see the bin directory
7: scroll down this dir tree, until you see ( media/ )
8: click on the ( media/ ) dir, and you will then see: mm1/ and mm2/
9: click on the ( mm1/ ) dir
10: Scroll down until you see a folder called ( pyano ) then click it.
11: Once inside this dir, you'll see the two files you place in there
12: Click on the file (example: drums) then click, the OK button
13: Repeat this process for each file. Since there are only two instruments. When you finish installing both of them:
14: Go back to the menu in ( Pyano ) and from the menu choose: CHANGE INSTRUMENT. You will then see the installed instruments, just choose one and play.

Hope this helps someone, and thanks again Nelson for all your help.