Great question!
In the Nurse App, select the 'Timecards' tab.
Under 'Timecards,' you will see two sections 'Pending' and 'Approved.' In the 'Pending' section, you will find both pending timecards and rejected timecards.
From there, you will be able to select the rejected timecard, see the reason for the rejection, edit the timecard, and resubmit the timecard.