If you want to edit a scheduled shift, hover above the scheduled shift you want to change. Then click on the pencil icon.
Here you can edit the selected shift and submit when done.
If it is a recurring shift, you may choose to edit this one shift or edit all future shifts.
To copy a shift you simply drag the shift using your mouse to another day or employee and choose the left icon (as shown above) to duplicate this shift.
You can also simply move the shift. Drag the shift using the mouse and choose the right icon to move the shift.
When you are dragging the shift you will see 2 icons, 1 left and 1 right on the field you wish to drag the shift unto. On the left side of the field you will copy the shift and on the right side of the field you will move the shift.
You can easily move or copy the shifts in this way.