Login to the Admin Dashboard. From the Students tab, select the checkbox to the left of one or multiple student's names. Click "Check in" in the top gray header row.

The Add signature window will appear. First you'll select the staff member that should appear as the signer on the attendance report in the drop-down menu. Next, select the date and time of the check in. Finally, you'll draw your signature in the empty field. Click "Add signatures" and the students will now show as "Checked in" in the Attendance status column.