Sign in to Google webmasters tools, then for verification, select the metatag verification. Then copy the metatag and have it. Open blogger and go to your layout page and select edit html ,and paste the metatag code which you have copied, after the title tags end . Save the changes. Now click the verify button in webmasters and your blog is verified.
In windows you can search for keyboard from start menu and open keyboard settings. Or you can go to Settings > Accessibility > Keyboard. In the keyboard settings window, toggle the switch that says "Use the Print screen button to open screen snipping". Hereafter whenever you press print screen button, you will be able to make a selection on the screen for a screenshot.