Pictures and videos of troubleshooting items are very helpful for us to efficiently help and fix troubles.
For iPhones & iPads: Simultaneously press the Home and Lock buttons.
For androids phones & tablets: Hold power and volume down buttons.
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 copy and paste it into the chat window or an email!