Required User Privileges: Company Admin / Screen Admin

The first step is to click on Manage at the bottom left corner of SalesScreen.

A menu will pop up, where you can proceed to click on Screens under the Company headline:

Once on the Screens management page, locate your screen and click on the screens eye icon, located all the way to the right of the screen: 

A popup with your screen preview will appear. Use the direction keys on your keyboard to jump between slides quickly.