You can upgrade your account anytime from your SiteSwan dashboard. If you would like to downgrade your account, please submit a ticket here:
https://support.siteswan.com/hc/en-us/requests/new
UPGRADING YOUR ACCOUNT:
STEP 1 - From your dashboard, hover over the "Account" tab and choose "Billing".
STEP 2 - Click the "Upgrade Account" button in the Billing section and choose the plan that you would like to upgrade to.