Chrome Extension:

If you would like to cancel your subscription/plan, click on the drop-down arrow next to your profile name: 




When the menu opens click on "Cancel Subscription".





Or you can downgrade your plan to the Free plan by clicking on See Plans and selecting the Free plan

Web App:

If you would like to cancel your subscription/plan, click on the drop-down arrow next to your profile name: 





When the menu opens click on "Cancel Subscription".




Or you can downgrade your plan to the Free plan by clicking on See Plans and selecting the Free plan