Use the Configuration settings on the tablet for set up:

The configuration settings are located by pressing the "RC" Cloud, or by swiping from the left on the tablet, from the home screen.

This is your source for enabling your hardware, setting up headers/footers on your receipts, credit card settings, as well as enabling functions and customizing the sales transaction flow

The configuration is in 5 sections:

Device: Used for setting the cashier/user display views as well as the customers check out experience

Receipt: Used to configure or modify your receipt headers/footers

Payment: Save your gateway settings and other acceptances on this screen. 

Hardware:  Configure your hardware settings 

General: Set up configurations for various aspects of POS activity