Welcome to the Community. It's important to be able to edit your transactions to ensure your books are up to date. QuickBooks Online is a great program that gives you the ability to easily track your sales and expenses. I'd be glad to help you edit your invoice.
This type of issue can be caused by browser cache and cookies as they can prevent the system from functioning effectively. I encourage you to refer to the following steps to complete some browser troubleshooting.
If the steps provided above don't work, I recommend that you contact our customer support team. They will be able to take a closer look at your account to resolve this. Here are some options available to reach out to our team.
Phone: Call us at 1-855-253-1536
Schedule a Callback or start a Chat: click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.