OK. Next step is to get the applet loaded to your cache, and, while we're at it, demonstrate that it won't work loaded across the 'net...
What you should see is a box above, looking something like this...
Running: Trying port 1
Last error: (none)
Nothing much will be happening, unless you are running in debug mode, in which case you will see a Security Exception.
OK. Now that you've digested that, we'll go on to the real thing... Hit the continue button below, and you'll see this same screen again, only this time, as if by magic (nothing up my sleeves, ladeeeeis an' gennellllmennnnNAH!) it'll work, and you'll see the port scan counting up 1 through 1024, and a URL of the logged output. Enjoy...
BobbyRite (b) 1997, Major Malfunction & Ben Laurie, All Rites reserved, all Wrongs revenged.