Hi Lucas
The information is in the QCWIN manual starting on page 3-49 (as the index states under "Check reconciliation").
In order to have the 'Check reconciliation' checkbox become active, you must first have the 'Retain History' checkbox ticked. Once you do this, you will be able to check the 'Check rec' box. You will not be able to reconcile cheques unless you tick this box.
You would then go into the 'Maintenance' toolbar option and select the 'Check Reconciliation' function in order to reconcile your cheques.
If you did not select to 'Retain history' when you first set up QCWIN, you will not have any check information in the reconciliation area to process right now. You will have to reconcile your checks manually.
However, if you have now checked the options to retain history and reconcile checks, from this point on you will be able to use this function in QCWIN to change the status of your check to one of the following: Cleared, Cleared with error, Reversed or Voided. If required, you will also be able to change the status back to Outstanding, provided you have not posted the status changes.