Arrows can be very useful when you want to point out something on an image, or you want to draw someones attention to a certain part of an image.
You can make your arrow look as fancy, or as simple as you like.
Click the image on the main window. Then on the left click the "Arrow" button. You'll see this window.
The most used options are the Width, Height, Shadow X, Shadow Y, and Border Width. Push the up and down arrow buttons to watch the arrow change. This will show you what your arrow will look like.
When you have the arrow the way you want, click <Ok> Then click the part of the image you want the arrow to point to.