"To tap the screen" means to lightly touch the screen of a device, such as a smartphone or tablet, with your finger or a stylus. This action is usually used to perform a command or select something on the screen. Full definition
You find the second set of menus, which is more specific to the document you're currently working on, by tapping the screen with your finger. (laptopmag.com)
Just double tap your screen, look into the camera, and smoothly access your phone without a second thought. (oneplus.com)
You will not succeed at collecting them by just tapping the screen. (waypoint.vice.com)