How can I Edit a Beginning Balance in the Checkbook

Thanks for choosing QuickBooks. 

You'll want to edit an incorrect opening balance through the View register of the account. Let me guide you with the steps.

1. Click the Gear icon, then select Chart of Accounts.
2. Locate the account, then go to the Action column and select View register.
3. Find the opening balance entry. If you've got the Date column sorted from newest to oldest, the opening balance entry may be at the end of the list.
4. Select the opening balance entry.
5. Edit the amount. 
6. Click Save. 

If you haven't entered an opening balance yet, please check this article on what to do: What To Do If You Didn't Enter An Opening Balance in QuickBooks Online.

For accounts that aren't connected to online banking: Entering Opening Balances For Accounts In QuickBooks Online.

Reply to this thread if you have any other concerns. I'm always here to help.