Welcome and thanks for reaching out to the Community, @carol-trailshed-.
If you're referring to the opening balance in your register, you can take or change it by going to the Chart of Accounts. Here's how:
In case you encounter issues when you reconcile an account, I suggest checking out this article for further guidance: Fix beginning balance issues during your first reconciliation in QuickBooks Online.
Also, here are some helpful references that you can check out about the account balance, like how to fix discrepancies:
Please let me know if you're referring to something else or if you have any other questions. I'll be here to help. Have a great day!