The billing cycle for your VIP account is managed directly from iTunes or Google Play, depending on the platform you are using. Modifying the billing options will only be possible for the owner of the account on these platforms.
If you are using iTunes, click here and check the subsection called "Manage your subscriptions".
If you are using Google Play, click here and check the subsection called "Change the frequency of your subscription".
Other articles about the Virtual Regatta VIP Subscription: