When you open a Dabble DB account, you choose a plan which determines certain capabilities of your Database. The capabilities include:
You can change your account plan at any time from the Administration. Click the Account Info tab and use the Downgrade or Upgrade buttons to change your account as needed. If you are still in your free trial, you can also switch to a free Dabble DB Commons account, which will release your data to the public.

Note that you can only downgrade to a lower plan if your database does not exceed the number of users specified in the lower plan.
If your application does exceed the limits, you will need to reduce the number of users in the database before you can downgrade.