CLick on the game link.
When the first screen loads, with Jack and his first mate, roll your mouse over the items on the screen.
Things will "light up". Two of those things are "plunder." You need to click on them to collect them. Each time you do, the plunder window will drop and show you what you got.
You should get two items in each room (except the dock where there is only the shovel). Once you've found them, click on the "door" with the keyhole in the center of the room and choose "Arrrr" when it asks you if want to move on.
If that freezes on you, you can also choose the "map" and move on that way past Tia's Shack to the Turkish Prison. If you've collected all the items (check the plunder chest to make sure) you can get into Davy's place, go through the last door, and play the tune to collect a VMK code.