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Hi there, greenstarclean.
Thank you for posting here in QuickBooks Community. I'll provide different steps on how you can change the details in your invoices. Then, how to delete or change customer's information.
To change the information you've entered in the invoice screen for a new customer, you'll need to go to the Sales page. From there, you'll see all invoices you've created.
Then, you're unable to delete or edit customer's information on the invoice screen. You'll need to go to the Customer's information page to perform this task. Please follow the steps below.
For additional information, you can click this article: Manage your customer list.
Please refer to this article on how the Sales page gives you a great at-a-glance view of the status of sales transactions, open invoices, and paid invoices: View sales transactions.
Please don't hesitate to tag my name below if you need further assistance or questions. I'd be happy to back you up. Have a wonderful day ahead.