You can remove an add-on by logging into your Oddbox account and clicking on the Manage Box tab.
Here you'll see the add-ons you have scheduled under the header Inside this box. Simply click on the dustbin icon next to the add-on you wish to remove, and you're done.
*Please note - You cannot add or remove any add-ons after the cut-off (9:00 PM, 3 days before your delivery is due).