Open the class you wish to make a seating chart for
Click on Seat, New Seating Chart
Arrange the seats as you wish, either keep the defaults or choose the number of rows and seats per row.
Make the font size a little smaller: Seat, Options, Set Fonts
To add photographs:
Click on Seat, Options, Set Label and click on Picture
Arrange the photographs into the configuration that you want by draging them
Change the size of the pictures: Seat, Option, Set Seat Size. Try 150
Save the file, give it a name that coresponds to your class name
Take attendance: Seat, Modes, Edit Today's Attendance
Click on the upper right corner of each picture to set Present, Tardy, etc.
Send it in: Seat, Modes, Send Attendance