There are two ways to block websites using Refocus:
Important: if you recently started using Refocus, the websites might not immediately appear in the picker. Please visit the website in Safari, and then wait 5 minutes for it to appear.
Important: if you use a third-party browser like Chrome, you must ensure that “Safari Only Mode” is disabled.
In addition to the above:
Important: if you use Safari, using “Additional Websites” will disable some features like Private Browsing Mode, or clearing recent browsing history. It also works worse than blocking websites with the “App & Website Picker” when using Safari.