You can uppgrade your existing subscription any time.
Pro-rated amount for the un-used period of your current subscription will be refunded
Procedure to follow:
Cancel your existing subscription
Login to your Wonder Lister account
Subscribe to the subscription package to which you want to upgrade
Cancelling your subscription
You can cancel your subscription any time. Absolutely no refunds after the trial period is over (unless you are canceling for upgrading your subscription).
Procedure to follow for PayPal subscriptions:
Login to your Paypal account
Find the Wonder Lister subscription from my Pre-approved payments
Cancel the subscription
Procedure to follow for Stripe subscriptions:
Login to your Wonder Lister account
Find the Stripe subscription that you wish to cancel