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You can install this free website blocker from the Google Play Store:  Open the {"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\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} Google Play Store. Tap the search bar. Type in blocksite, then tap Done or Enter. Tap Block Site - Block Distracting Apps & Sites. Tap INSTALL, then tap ACCEPT when prompted. Tap OPEN in the Google Play Store, or tap the shield-shaped BlockSite app icon. To do so:  Tap GET STARTED when prompted. Tap GO TO SETTINGS. Tap GOT IT. Tap BlockSite. Tap the grey "On" switch. Tap OK when prompted. It's in the bottom-right corner of the screen. Doing so opens the WEBSITES tab. If BlockSite didn't automatically open when you turn it on in Settings, re-open it before proceeding. Type the address of the website you want to block into the text box at the top of the screen. For example, if you want to block Google, you would type in www.google.com here. It's in the top-right corner of the screen. This will block the website in Firefox. BlockSite will also block your selected website in other browsers (e.g., Chrome) on your Android.
Install BlockSite. Open BlockSite. Enable BlockSite in your Android's Settings. Tap ＋. Enter your website's address. Tap .