Make sure you have the webpage that you want to capture centered on your screen. Look at your keyboard and find the 'Print Screen' button. This is usually somewhere near the top right, to the right of the F12 key.
In some systems, it works fine for you to just press the 'Print Screen' button, but with mine, I have to press 'Ctrl' and 'Print Screen' at the same time. Some systems require you to press 'Alt' and 'Print Screen' at the same time. Try one, test it with the next step or two, and if that doesn't work, try it the other way.
After you've captured your screen, you need to have somewhere to put it!
The easiest place is in your Paint. If you have Windows, you almost certainly have Paint. Look in your start menu.
Start Menu --> All Programs --> Accessories
Once Paint is open, you will see a blank screen. Perfect for pasting your screen capture!
Up at the top in Paint, you will see the Paint menu. Click on Edit and select Paste. Your screenshot will be pasted right there! If Paste is not an available option, that means that your screen was not captured. Try capturing it again with the step I listed above. Try 'Ctrl' and 'Print Screen' together or 'Alt' and 'Print Screen' together, and test it by checking the Edit menu in Paint.
Now that you've taken your screenshot and found somewhere to put it, you could be done! If you like using images as bitmaps or find that it doesn't matter to you either way, then just save your screenshot and you're done.
If you want to crop or otherwise edit the photo, save it and reopen it using your photo editing software. When you save it after editing, it's best to save it as a jpeg. How to edit the photo is a tutorial for another day. I hope this post helped someone!
Originally posted on my blog in March of 2010