The location and usage of the paint bucket tool in PS software are as follows:

1, first open the PS software, and then create a new blank canvas in PS.

2. Next, you can find "Paint Bucket Tool" in the toolbar on the left.

3. Then press Ctrl+j to copy the background layer.

4. Then select "Rectangular Box Selection Tool" in the left toolbar to draw the selection on the canvas.

5. Finally, continue to select "Paint Bucket Tool", adjust the required color, and click the left mouse button in the selection area.