Samsung SM-J320F User Manual page 21

Basics
Tapping
To open an app, to select a menu item, to press an on-screen button, or to enter a character
using the keyboard on the screen, tap it with your finger.
Tapping and holding
Tap and hold an item or the screen for more than 2 seconds to access available options.
Dragging
To move an item, tap and hold it and drag it to the target position.
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