Safari - Visitors can unsubscribe by opening Safari preferences from the “Safari” menu, clicking on the “Notifications” icon, finding your website in the list of sites, and choosing “Deny” (instead of “Allow”). Note that removing the website will simply cause the visitor to be prompted again, the next time they visit your website.
Chrome (Desktop) - In the bottom right corner of your screen, users click the up arrow. They then click the ‘bell’ notification icon and then the gear icon . They simply need to uncheck any website, extension, or app you don’t want notifications from.
Chrome (Android) - In the upper left side of the website address bar, users can touch the lock symbol. From the the drop-down menu for Notifications, they can Allow or Block notifications.