Thanks for joining this thread, deycomin.

I do have the steps to help you get back to business. To enter the opening balance, you can create a journal entry by following these steps:

1. On the left panel, click + New > Other > Journal Entry.
2. Select the Journal date. Make sure it's before the oldest transaction already in your account. 
3. On the first line, select the account you want to enter the opening balance for. You can use your bank statements to enter the opening balance.
4. Select Opening Balance Equity in the Account column on the second line.
5. Enter a note in the Description field so you know what the journal entry is for.
6. Click Save.

Once done, make sure to manually reconcile the transaction in the bank register. This way, the beginning balance shows up in the reconciliation page.

Here's how:

1. On the left panel, select Accounting > Chart of Accounts.
2. Click the Account history link of the bank account you want to reconcile. Search for the opening balance journal entry, and select it to expand the view.
3. Under the Reconciliation status column (Indicated by a check mark), click the blank field until you see an R. This reconciles the transaction. Select Save.

Please see sample screenshots below:

To view the detailed instructions, you can open this article: What to do if you didn't enter an opening balance in QuickBooks Online.

When you're ready to reconcile in the future, here an article link: Reconcile bank accounts in QuickBooks Online.

I'm just a few clicks away if you have any additional questions. Have a great day!