Hi there, KathM.

The option to edit the text in the Remittance Advice is still not available in QuickBooks Online. You'll want to manually edit the body of the email before sending it out to your clients. 

We appreciate and have taken note of all the feedback and feature requests that are shared in this thread. Please continue to check QuickBooks Blog site where you can see all the latest features and updates. Here's the link: https://quickbooks.intuit.com/uk/blog/.

Let me know if you need anything else. We're always here to help.