The account admin can access the billing portal here to update your account's payment method.

Click your user icon in the upper right hand corner of your screen, then click "Billing" to navigate to the billing portal

Alternatively, this may also be accessed through the sidebar:

Then, click "Change" next to your existing payment information.

Toggle the radio button from "Credit Card" to "Paypal".

You'll then be redirected to the Paypal website to login and enter payment details. Once finished, you'll automatically be redirected back to your AgencyAnalytics billing portal.