It seems like there may be an issue with the domain settings for the website where you purchased the cleaning supplies. The message suggests that you need to connect an existing domain, airbnb.pharmapacks.com, in order to finish setting up your web address.
If you continue to experience issues, you may want to contact the customer support team for the website where you made the purchase, or for Shopify if the issue is related to their platform. They may be able to provide more specific assistance or guidance for resolving the issue.