Open the webpage that you want to take screenshot.
Now add "aviary.com/" before the url in the browser and press Enter.
For example:
If your want to take screenshot of Google homepage then you have to type aviary.com/ before http://www.google.com/ finally the look will be
aviary.com/http://www.google.com/
and press Enter and wait untill any options

The whole image will be loaded and you can save that in your hard drive or online with your little informations. You can also edit the image with the image editor of aviary.