Some app icons can be changed into a convenient widget to use on your Home screen.
Touch, hold, and release a Home screen icon.
A blue frame appears around the icon if it can be resized and changed into a widget (if it can't, only the Edit icon is displayed).
Drag the corners of the frame to make it larger and change it into a widget.
Touch, hold, and release the widget again to change the size of the widget, if necessary.
You can also change it back into a normal icon by dragging the corners of the resizing frame back in.