I need to undo changes I made today

My main goal is to ensure your books are accurate, olympia1.

To ensure I can provide the accurate steps, may I know what entries you've created or the task you've performed in QuickBooks Online that you want to undo? Adding additional details would be a great help. 

Please don't hesitate to click the Reply button to share more info. I'll keep an eye on your response, and I'm always ready to assist.