You can change from a monthly Premium subscription to an annual one or the other way around.
How to change your subscription from monthly to annual:
Wait until the subscription has ended.
Log in to your Singa account and resubscribe Premium as an annual subscription via the "Get Singa Premium" button. The button can be found at the top of the page or under the user account under Settings > Billing.
The change from annual to monthly subscription is done the same way as above, but when you subscribe to Premium, you must choose the monthly subscription.
Please note that the subscription type can only be changed after the previous subscription has ended.
Need help? Kindly get in touch with support@singa.com