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First you have to create an account. Do that at the top where it says Log On / Sign Up.
Then as your car gets updates you can add them to the list. Just don't expect to get everyone. I don't know that anyone outside of Tesla knows why any particular car gets any particular update. I just got the latest today despite there having been 5 or 6 updates since I last received on.
As has been mentioned most updates are very minor. I think we're all waiting for the next big one, version 8.0.
That may be because they are minor fixes and improvements. When an update gives new functionality they'll tell us. That's not likely until the big 8.0 update.