Click Apps in the menu at the top of the page, and select Explore more apps.
On the marketplace, search for the app
Select Try it free to start a 30-day free trial
When the free trial is over:
If you added credit card details or linked a PayPal account you will be automatically charged.
If you use bank transfer, check or ACH you will receive an email with a payment reminder. You will have a 14-day grace period.
If you have not paid for the subscription, the created links will still be available, but you will not be able to create new links or edit existing ones