If you don't want to punch your PIN in every time you start a transaction, you can set Comic Shop Assistant to Single User Mode.

Go to MORE>SETTINGS>THIS DEVICE and enable singleUserMode.

 

This mode will assume that the logged in user is the person ringing people up and some other things that a pin is normally required for.

 

This mode will expire when a user session is expired. So if your device is idle for more than about a half hour, you will need to re-enable it.

 

CAUTION: This mode means that if you have multiple people ringing on a register, you won't know for sure who did the actual transactions or other pin-required actions. It is not recommended for stores where employees are sharing a device.