You change your delivery frequency in your customer account. Here's how to:
1. Log in to your customer account.
2. Go to "My subscriptions" in the left side menu line.
3. Press "Edit" next to your active subscription.
4. Press "Edit" under "delivery schedule".
5. Choose how often you want your box to be delivered (1=every week, 2=every second week, etc.)
6. Press "Update Schedule".
Please note that all changes to your upcoming box must be finished Friday at 23.59.