I'll help you to modify your opening balance, darryl5.
Opening depends on the transactions you've made. You'll have to edit the charge in your transaction instead. I'll show you how, please follow the steps below:
Note: You'll have to make sure to set this as Reconcile (R).
Also, you can visit here in the reconcile hub. You can select articles here that might help you about reconciliation especially in the troubleshooting section.
Reach out to us anytime for more questions. We're always happy to help! Have a good one.