You only have to enter access codes once for each course group you wish to access. Then, you can just Sign In to your MyLearning account in MS IT Academy.
The Microsoft IT Academy Online Learning Program page will display.
Click the Access Site button.
Click the Sign In button.
On the right side of this page, enter your Windows Live ID username and Windows Live ID password.
Click Sign In.
All the course group courses for which you have entered Access Codes will be displayed.