I have connected a Bank Account in QBO. While connecting i have added a Opening Balance which is wrong. Now i need to modify it. But i cant find it in the Bank Ledger.

I'm here to help you modify your opening balance, connectzain.

Let's sort the transactions to find your opening balance in the Account history.

Here's how:

1. Go to the Accounting menu.
2. Select Chart of Accounts.
3. Locate the account, then go to the Action column and select Account history.
4. 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.
5. Click the Date drop-down icon.
6. Select the opening balance entry.
7. Edit the amount. 
8. Select Save.

To ensure your QuickBooks accounts match with your real-life bank statements, I suggest checking this article for the detailed steps: Reconcile an Account.

In case you need further assistance in managing your bank transactions, please let us know.