Here is what you need to do, its very easy...
Log in at this page https://www.quant-investing.com/login
If you have forgotten your username click the link Forgot your password? below the Login button
After you have logged in click the new menu item Account which will appear in the top menu
On the next page click the button Maintain subscriptions
First cancel your existing subscription, if any
Then click on Order new Package and follow the steps.