Summarize the following:
This app is grey with gears on it. You'll usually find it on the Home Screen. It's about a third of the way down the Settings page. This is the second large group of settings on the page. It's near the bottom of the "GENERAL" section of settings. 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 app will no longer block pop-ups.

Summary:
Open your iPhone's  Settings. Scroll down and tap Safari. Scroll down to the "GENERAL" group of settings. Tap the green "Block Pop-ups" switch .