Just target something to set the tracking of creatures of the same type on. Then target something else and the tracking will be switched to track creatures of that another type. Please review the translations, including the English one.
HoTorDoT shows timerbars for (de)buffs that you put on your current target. Currently has no configuration, the anchor can be requested and moved via the following piece of script: /script LibStub("AceAddon-3.0"):GetAddon("HoTorDoT"):ShowAnchors()