Summarize the following:
Tap the grey app with gears on it to do so. You'll likely find Settings on the Home Screen. It's at the top of the third main group of options near the top of the Settings page. It's in the middle of the page. This is the code you set when you turned on Restrictionsnot necessarily the same as your iPhone's regular passcode. If you haven't yet turned on Restrictions, instead tap Enable Restrictions and then enter your preferred passcode twice. This area is about halfway down the page. It's near the top of the page. A blue checkmark will appear to this option's left, signifying that it is active. Do this in the "NEVER ALLOW" section (not the "ALWAYS ALLOW" section) near the bottom of the page. This should be the website you want to block; make sure you include all parts of the website's URL (e.g., "www.example.com" rather than "example.com"). It's a blue button in the bottom-right corner of the keyboard. This will block your selected website in Safari.
Open your iPhone's Settings . Scroll down and tap General. Scroll down and tap Restrictions. Enter your Restrictions passcode. Scroll down to the "ALLOWED CONTENT" section and tap Websites. Tap Limit Adult Content. Tap Add a Website. Type in your website's URL. Tap Done.