On Youdot, you only have one payment call on the last day of the month, which includes all your purchases and registrations in a single downloadable invoice.
Click on the "Bills" tab in the "Transactions and billing" section of your account. All of your invoices should be available in PDF format.
If a blank page appears when you click the button, just wait a few seconds for your invoices to load.
If you want your upcoming invoices to have a different billing address, remember to change your details from your account before the payment call (on the last day of the month).