You will need to go back to the official and go to s’incrire pour declarer et payer. Follow the process to enter your SIRET number and personal details, as well as the IBAN number for your business bank account. Once you validate this registration, you will have to complete and send a copy of the autorisation de prélèvement to your bank, to enable automatic bank transfers when you will declare your turnover.
After completing the online registration to declare and pay, you should be able to make your first turnover delaration within 24 hours. Go back to the site and click on declarez et payez. Log in and enter your quarterly turnover, before validating the percentage of social charges and proceding to the bank tranfer.