Step 1

In the Hub Side Navigation Pane, go to the Billing: https://hub.easywork.asia/dashboard/my_plan



Step 2

Billing > Cancel Subscriptions > If you are sure, click "Yes" button. 



Step 3

And that's it! You have canceled the subscription plan.

Again, note that the reversion to Free Plan doesn't happen until the end of the current bill cycle.