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If you're unable to use your tablet's buttons or a palm swipe, you can download a free app that will allow you to take screenshots: Open your Android's {"smallUrl":"https:\/\/www.wikihow.com\/images\/1\/1e\/Androidgoogleplay.png","bigUrl":"\/images\/thumb\/1\/1e\/Androidgoogleplay.png\/26px-Androidgoogleplay.png","smallWidth":460,"smallHeight":531,"bigWidth":"26","bigHeight":"30","licensing":"<div class="mw-parser-output"><p>I edited this screenshot of an Android icon
<\/p><p>License: <a rel="nofollow" class="external text" href="http:\/\/en.wikipedia.org\/wiki\/Fair_use">Fair Use<\/a><br>
<\/p><\/div>"} Play Store. Tap the search bar. Type in screenshot easy. Tap Screenshot Easy in the results menu. Tap INSTALL. Tap OPEN in the Google Play Store, or tap the camera-shaped Screenshot Easy app icon in your Android's App Drawer. Doing so allows Screenshot Easy to access and save photos. You may be prompted to start capturing. If so, tap CANCEL before continuing. The switch will turn blue, indicating that a camera-shaped icon will appear on your tablet's screen even when the Screenshot Easy app is minimized. It's a blue button at the top of the screen. This turns on the screenshot feature for Screenshot Easy. Open the app, screen, or page on which you want to take a screenshot. It should be in the top-left corner of the screen. Doing so will take your screenshot and, after a few seconds, open the screenshot in the Screenshot Easy app. Once the screenshot opens, you can save the screenshot to your tablet's Gallery by doing the following: Tap in the top-right corner of the screen. Tap Save. Tap Save as. Tap Android when prompted. Tap SAVE when prompted. You'll find your screenshot in the "Downloads" folder of your tablet's Gallery app: Open your tablet's Gallery app. Tap ALBUMS at the top of the screen. Tap the Downloads folder. Tap your screenshot to open it. It may take the screenshot a few seconds to render full quality. When you're ready to turn off the screenshot icon, re-open the Screenshot Easy app, then tap STOP CAPTURE at the top of the screen. An ad will usually play after disabling the screenshot icon. You can skip the add by minimizing or closing the Screenshot Easy app.

Summary:
Download the Screenshot Easy app. Open Screenshot Easy. Tap ALLOW when prompted. Tap the grey "OVERLAY ICON" switch . Tap START CAPTURE. Tap START NOW when prompted. Go to the item you want to screenshot. Tap the camera icon. Save your screenshot. View your screenshot. Disable the screenshot icon when done.