If you want to discontinue your Starter plan then you only need to click on the “Unsubscribed” button. But we would suggest you continue your plan until the end of the month. Because if you discontinue your plan in between the month you have to pay for the remaining month too even if you aren’t using any service.
Discontinue only if the month is over, it’ll be in favor of your pocket. Click here to know about the Starter Plan.