Samsung Galaxy Note5 User Manual page 192

The Gallery app opens.
2. Tap the picture you want to modify.
3. Tap Edit
> Drawing.
Drawing tools display.
4. Use the S Pen or your finger to draw on the picture.
Tools and options are:
Pen: Select a pen type, stroke size, and color.
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Erase: Use the S Pen or finger as an eraser. Tap again for additional options.
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Undo: Undo the last action.
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Camera and Video 181