How do I change from a monthly to a yearly plan?

Important: Monthly billing is only available on full-price Pro and Team subscriptions. It is not available with grandfathered plans, education or non-profit plans, and some other discounted rates.

In the bottom left-hand corner of your Wavebox, hover over the ⚙ Settings icon and click on My Wavebox. This will take you to the Admin Portal.
In the Admin sidebar, find the heading Subscription and click on Billing.
Find the button for View Billing Portal

From your Stripe Billing Portal homepage, click on Update Plan.

Switch to your preferred payment plan.