To do this task
If you're using Online Account Access or Online Payment, be
sure you've downloaded all the online transactions through the
ending date of your paper statement.
Go to the Lists menu and click Chart of Accounts. Double-click the
Move to the blank transaction at the end of the register.
Enter the missing transaction.
Return to the Reconcile window by clicking it or by choosing
Reconcile from the Banking menu.
Mark the transaction as cleared.
In addition to adding a missing transaction, you can also
fix errors in existing transactions.
Troubleshoot reconciliation problems