By clicking on Menu  > Subscription, you can view a list of the guard licenses and panic users that you have, as well as the Subscription state (Free Trial, Active or Cancelled).

Once you have changed your status to Active, you can view the date and amount you are being charged.

To select a payment method, click on the Configure Payment Method button, where you can enter your credit card details. 

After providing the information and clicking on Add Payment Method, you will be redirected automatically and your details will be saved.

In case you want to change the information that you have provided, you have to click on the Modify Payment Method button.