This guide will assist you in changing the billing day.
Note: You are NOT ALLOWED to change the billing date if the subscription has expired, please ensure that the subscription is still valid.
To change the billing date, go to SUBSCRIPTIONS. 
In the SUBSCRIPTIONS page, determine which subscription's billing day you would like to change and click on Manage.
Click on CHANGE BILLING DAY.
Enter the new date and the additional fees to be charged will be calculated and shown accordingly. Once confirmed with the date, select Save & Proceed to Payment.
A confirmation message would appear, select Yes to proceed.
Users would then be redirected to the subscription portal to make the payment, once the payment has been made, the billing day will be changed.
END OF GUIDE