To cancel your free trial of Dropbox Professional:
- Sign in to dropbox.com.
- Visit the Account page.
- Click Cancel Trial.
Once you click the Cancel Trial link, your trial will end, and your account will revert to a free Dropbox Basic account.
Note: When you revert to a free Dropbox Basic account, your account will be downgraded to the 2 GB free Dropbox Basic account, plus any referral space you may have earned. And your account will no longer have the advanced features of Professional.