Once you have upgraded to a paid account, changing your plan to another paid account is easy. Open up the Manage Subscription window to get started.
Choose either a Monthly or Annual plan and click the Select button under the plan of choice. Once you confirm the change, your account should update within a few seconds. Expect an email from Recurly notifying of the status change.
The cost of the new plan considers what you have paid for and utilized for your previous plan, and prorates accordingly.