To blur an image in Photoshop, use the Blur tool. To blur an image more effectively, use a narrower aperture (smaller number next to the Blur button on the left of the main editing screen).
To blur a layer in Photoshop, you can use the following steps: 1) Choose the layer to be blurred. 2) Choose the Blur tool. 3) Click on the desired amount of blur. 4) Drag the mouse over the area to be blurred to make it more or less blurry.