Daniele:

0 copy .st ended files to Squeak workin directory (that is where you .image
file is)

1 Open Squeak 

2 go to right side of screen, to Tools flap

3 drag the FileList icon until FileList window is on the screen.

4 select the file , you must see what buttons change and last is "install".
Click on this.

5 In Tools flap you can drag a Workspace and SystemBrowser, for complete the
exercise

I must leave now, but could send mail if still having troubles

edgar