Glad to have you here in the Community, @peggyp1.

I want to ensure this is taken care of, but before I do, may I know the specific error you receive? Any information can help us determine the cause of the issue.

In the meantime, let's perform some browser troubleshooting steps. Let's start by accessing QuickBooks (QBO) account using a private browser. The following are the shortcut keys you can use:

• Google Chrome: press Ctrl + Shift + N 
• Mozilla Firefox and Microsoft Edge: press Ctrl + Shift + P
• Safari: press Command + Shift + N

If this works, you can clear the cache and cookies of your browser. If not, you can use another supported browser. Possible that your current browser may have a temporary issue with QuickBooks.

Let me also attach this article that you can read for future reference: Customize invoices, estimates, and sales receipts in QuickBooks Online. This link can walk you through the steps on how to add information to your invoice.

If you have any other follow-up questions, let me know by commenting below. I'm here for you. Have a great day!