Swipe down from the upper right corner. In the middle of the screen, you may see a button appear for a few seconds, tap it. It may give you access to a slide with which you can adjust the brightness of the screen up or down. If you dim it too much, you may not see a screen! Here is a page showing how to increase brightness. --However, it should serve to show you where the controls are.
http://www.instructables.com/id/Fixing-lost-brightness-on-an-RCA-tablet
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