If you are logged in, head over to the pricing page and simply choose a different plan. The system may ask for you to enter payment information again.

Our billing system automatically pro-rates based on your plan’s billing date, and the date you change your subscription plan. This ensures that any unused portion of your old plan will count as a credit towards your new plan.

As an example, if you pay for a yearly subscription, then transfer to a monthly plan after only 1 months, only 1/12th of your yearly fee will have been used. The remaining portion will act as an account credit that can be used with any other plan.