Here's how you can install a screenshot applet to the bottom panel in Cinnamon on Linux Mint 14 or 13.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
wget http://goo.gl/zA5zx -O Screenshot.zip unzip -q Screenshot.zip -d ~/.local/share/cinnamon/applets
For more, see the original article at the link below.