The Database of the Month computer needs to run in kiosk mode, like the catalog iMac in the Children's Room. This will restrict it so it can't be used to browse the Internet.

Click on the iCab icon in the Dock, which is hiding at the bottom of the screen. After iCab starts, type the Apple key + K. The kiosk mode box will appear. The password will be hidden as four dots. Click OK. iCab will now be in kiosk mode.