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For iPhones & iPads: Simultaneously press the Volume Up and Lock buttons.
For androids phones & tablets: Hold power and volume down buttons.
On Windows, the most common way is to press the "Windows" and "PrtSc" keys at the same time on your keyboard
On Apple computers, press "Command", "Shift", and "3" at the same time
How to Use Skitch to Take a Screenshot
Once you download Skitch and open it, you'll have a little arrow/feather icon at the top of your screen.
After you take the screenshot, you can simply drag it into the chat window or send it in an email to email@example.com.