In one sentence, describe what the following article is about:

Tap the Settings app icon, which resembles a set of gears on a grey background. This option is around a third of the way down the Settings page. It's about halfway down the page. The switch will turn white {"smallUrl":"https:\/\/www.wikihow.com\/images\/2\/25\/Iphoneswitchofficon.png","bigUrl":"\/images\/thumb\/2\/25\/Iphoneswitchofficon.png\/47px-Iphoneswitchofficon.png","smallWidth":460,"smallHeight":294,"bigWidth":"47","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an iPhone 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>"}, signifying that your iPhone's Safari browser will now allow cookies. If the "Block All Cookies" switch is white, your iPhone's Safari browser is already enabling cookies.
Open your iPhone's  Settings. Scroll down and tap Safari. Scroll down to the "PRIVACY & SECURITY" heading. Tap the green "Block All Cookies" switch .