It's on the Osprey main page. If you came into the forum directly, you were misguided by someone. You should always come into osprey via The registered students page
Once you've chosen your subjects, and the page has refreshed itself, you will see the downloads section in the bottom left. The username and password are all over myUNISA so you shouldn't have a problem. The tut101 letter is available in pdf and MSWord format.