Please go to the Start tab, and choose Account Setup. On the left sidebar, click on Account Billing, and find the Cancel Account link on the right to cancel your unused account.
If you would like to cancel your trial account, just let your trial period end on it's own. Your data would be suspended but secure, and you can always return to using Ragic. If you would like to delete your account entirely, please contact firstname.lastname@example.org.