Thanks for joing us here, Caroline2019.
This is very unusual that you're unable to edit an invoice. Clearing the cache should fix this.
If you have other browsers available, you may use them. Also, make sure they are updated cause old versions can also result to errors.
In addition, I suggest reaching out to our Customer Support Team so they can further investigate this issue.
- Go to Help and click Contact Us.
- Enter Edit invoice and select Let's talk.
- Choose either Start a message or Get callback.
I've added some articles for more details about invoicing in QuickBooks Online:
I'll be here if you need anything else. Stay safe!
