Help near my TI89?

I am trying to install "Calculus made easy" on my TI89, but I am having a concrete time entering the activation key, i dont know how to enter the numbers, how do I do that? Also, my calculator froze giving me an error message, and i hang on to trying to past that but I cant, the eyeshade is the same, it keep saying its busy at the bottom
I stipulation my calculator tomorrow for my calc exam


Answers:    use this:http://rds.yahoo.com/_ylt=A0geu7aTSg5HoG...

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