Welcome to the Apple Support Communities
To take a screenshot, press:
- Command, Shift and 3 keys > take a screenshot of the whole display.
- Command, Shift and 4 keys > take a screenshot of one portion of the display.
- Command, Shift, 4 and Space keys > take a screenshot of a window.
On Mac OS X Snow Leopard, it's not possible to use AirPrint, but if you have the printer attached to a network, you can access to it wirelessly. Another option is to use Bonjour on your PC and share the printer with your Mac
Two options available for you:
Using keyboard shortcuts - Pressing "Shift"+"Command"+3/4 to screenshot whole screen or selected area.
Using professional screenshot tools like Jing, Skitch, Grab for Mac to snapshot anything displayed on your Macbook.
While, if you wanna take screenshot of whole web page, then this Webpage Screenshot Capture is a better choice. You can easily get a thumbnail of the screen you want to capture.