You are not allowed to change your billing cycle yourself at the Client Area. If you need to change your billing cycle, please create a ticket [https://support.host1plus.com/index.php?/Tickets/Submit].
You need to log in to your Client Area to pay the invoice manually or select a different payment method. If you have any questions regarding your payments, contact us directly at support@host1plus.com.
You can always upgrade your hosting plan at your Client Area. Click here [https://support.host1plus.com/index.php?/Knowledgebase/Article/View/1232/0/how-to-upgrade-my-web-hosting-plan] to see a full guide how to upgrade your services.