Type www.capinnacle.com on the address bar on your browser (Google Chrome, Mozilla Firefox, Internet Explorer etc). 

Click on the 'Products' page. You will see a button called "Activate Product Key". Click on that.

You will be taken to a ‘Product Activation Page’ where you can choose a user id and password and also feed in the activation code to get the test series. Your account will be automatically created and you will be directed to the inbox where you will see all the tests. You will also get an email notification of the same.