To set yourself up with a one month trial, please login to your Clever Credit account and from the front page you'll see a "Manage Redemption Codes" section. Click on "Request Trial Code" as seen below and from there you'll have a new redemption code for your own use.
This code can only be generated once and can not be regenerated. After generating this code, log out and use the Enroll option on the top of the homepage. This is where you'll paste your code to sign-up.