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You can take a screenshot using your iOS device.
If you use an iPhone X, scroll down for more instructions.
1
Press the Power and Home buttons.
On iPhone 6 and later the Power button is on the right side of the phone. Earlier devices have the Power button at the top.
2
Your screenshot can be found in the Screenshots album in the Photos app.
Extra: Annotations
After taking the screenshot, a thumbnail of the screenshot will appear. Tap on the thumbnail to open a screen where you can annotate your screenshot.