You can update your subscription delivery frequency in the 'Delivery Frequency' tab of your account section. If you're on desktop, it's on the left hand side menu. On mobile, click on My Account and then from the menu select Delivery Frequency. Please be aware that changing the delivery frequency of your subscription will not affect the next dispatch date of your refills - find out how to do that here!
Check out our video below which guides you through the process!