Is there a way to reopen a reconciled statement? I entered the wrong ending balance amount

Yes. There's a way, dellis1229.

We'll have to undo the reconciled transactions. You can either do this manually or let your accountant undo the reconciliation at once. Here's how to manually undo them:

1. From the Accounting tab, select Chart of Accounts.
2. Locate the account and click the View register hyperlink.
3. Select the transaction.
4. In the Reconcile (✓) column, toggle it until it shows as blank.
5. Click Save.

Afterward, you're good to enter the correct ending balance. 

If you'd want your accountant to do this for you, you can share this article with them for the steps to do it: Undo your client’s reconciliations.

Once done, you can reconcile the transactions again. You can also check this article for more information on the reconciliation workflow: Learn the reconcile workflow in QuickBooks.

I'm just a post away if you need help in reconciling the transactions.