Open your iPhone's Settings This app is grey with gears on it. You will usually find it on the Home Screen. Scroll down and tap Safari. It is about a third of the way down the Settings page. Scroll down to the "GENERAL" group of settings. This is the second large group of settings on the page. Tap the green "Block Pop-ups" switch It is near the bottom of the "GENERAL" section of settings. The switch will turn white This signifies that your iPhone's Safari app will no longer block pop-ups.