If you haven't already:
Click Tools (ALT+L).
Click Resume Session (ALT+R).
Open the session:
The unsigned sessions list includes sessions that you left unsigned deliberately, as well as sessions that "timed out"—the session closed automatically due to lack of activity at the workstation—within the last 48 hours.
Sessions are listed oldest to newest from the top down, and each line includes the medical record number and name of the patient as well as the date and time of entry.
Click the line for the session you want.
Click OK (ALT+O).