Taking a screenshot on your Apple Watch is just as easy as taking a screenshot on your phone: hold down the only 2 buttons available on the device at the same time.
Click the scroll wheel ("digital crown") and the contacts button simultaneously. The watch will make an audible sound, take a screenshot and then sync it to your iPhone’s Photo library in a few seconds.
To access the screenshot, just navigate to your Photos and by the time you get there, the screenshot will have synced there.
Wondering if you should get one? Read my Apple Watch review to find out.