Thanks for posting in the Community, @sgstudios.
I'd be glad to help provide information about the beginning balance for reconciliation.
Fixing the beginning balance amount for your reconciliation may depend on the situation. If you've already reconciled a previous period, you'll need to undo the previous reconciliation.
You can only edit the amount on the register if you haven't reconciled a prior period. You may also check this article for information about incorrect opening balance: Fix an opening balance to match a bank statement.
This should set you on the right track. Let me know if you have other questions about the reconciliation process. I'm here if there's anything else I can help you with.