Yes! In order to change your plan, just go to your Settings Page and under Plan & Payment, click Change Plan.

If you downgrade, or change from yearly to monthly billing, these changes will only take affect at your next scheduled renewal date.

If you want to upgrade, you will be billed immediately for your new plan and any unused time on your existing plan will be added to the next renewal date.

You can find information here about how to pause your subscription here and what happens if you cancel your plan here.