Even if you are not using Auto renewal, you can still prepay for the next billing period at any time to extend your plan.
To make a manual renewal, go to Menu > Payment information > Settings, open the Plan section, and click Renew now.
This will prepay for the same plan you are currently using and extend your usage period starting from the current plan’s expiration date.
Manual renewal is only available when Auto renewal is turned off. If Auto renewal is enabled, the next billing will be processed automatically instead of using manual renewal.