When placing your first order, you will need to enter a billing address.
It will be automatically pre-filled if, in step 3, you choose to have it delivered to a predefined address.
If you choose the delivery option to your veterinary clinic or DPD relay point, you will then have to enter a billing address.
To do this, you have 2 possibilities:
click on the "+" icon Add an address
click on "Create a billing address"
As long as you have not defined a billing address, you will not be able to access the next step (the "Continue" button is grayed out / not clickable).
During your next order, in step 3 of the order process, you can change your existing billing address or create a new one.