Of course you can! If you change your mind you can cancel your order at any time up until it has been 'packed' for a full refund. To cancel your order login to your account, go to 'order history' and here you will see your order with an option to 'cancel'. Your refund will be processed automatically.
If your order has already been packed, you won’t be able to cancel your order and would need to return for a refund, you can follow the link below to return the products in the package they arrive in - within 14 days. Upon receipt we will contact you to issue a full refund for all unopened/undamaged products -https://cdn.gruum.com/wp-content/uploads/2020/12/14142538/Returns-form.pdf
To change/cancel your next kit, simply login to your account an go to 'My plan' then 'Edit kit. Here you will find all the options to amend or cancel your plan. That way you shouldn't receive any unwanted kits.