Yes, the subscription is completely flexible and you can opt out at any time by logging into your account section and selecting "Manage Subscriptions".
This will take you to a tab called "View your next order". Here you can click into your subscription (s) and there will be the option to "Cancel Subscription 💔".
You can also get to the same "Cancel Subscription 💔" button by selecting "Manage Subscriptions" and selecting the same button.
It's dotted about all over the account to make subscription management as easy as possible - no one likes subscription surprises!
If you do not wish to opt out your subscription, there is also an option to change the frequency or reschedule your order date.