Here is what I found from their Terms of Service.
They are referring to 1 of the 3 paid options. The free option does not have a "trial" period.Your 30-day free trial begins when you complete your registration. After the 30-day trial period, you will automatically be billed at the rate of $9.95 per month for the Enhanced Package's monthly plan, unless you upgrade (during or after your trial period) to an annual package. Cancel at any time by visiting the account billing page.