Hi when you have installed then, go to videos, add-ons, and you should get a list of add-ons..... You can do this on any of the add-ons in the list in program's, get add-ons,video add-ons. If you ever open a add-on and there's nothing there, go back up, menu, force fresh, this freshs the repo. Hope you understand this and it good to have a look round so you get the feel for how it works.