When you log into your Credit Manager account, you'll be taken to your dashboard, which will display details such as your current credit score. Scroll down the page until you see a detailed graphic showing the features that are included in a Premium Membership. Click on the "Try it Risk Free Now!" Action Button to begin the upgrade process.
Or you can click on your name in the upper right-hand corner of the screen when you're logged in and then click "membership options" and choose the premium account type. You will be prompted to enter your credit card number in order to complete the upgrade process.