To block or allow trackers while on a site, click the blue Ghosty in the top right corner, allowing you to see a list of each of the trackers found on that site.
To block the tracker for this site and all future sites (or globally), slide the toggle to the left or red. To allow a globally blocked tracker just on one site, click the circle next to the toggle, so it goes green. This enables the tracker only for this site, but keeps it blocked when appearing on other sites you browse to. Refresh the site to view the changes made.