Hi, to add an add-on go to.....
> file manage > add source> you should get a box come up. In the top box type in
http://srp.nu
Now click done, go to the bottom and get it a name like
Superrepo click done and go back click on system , add-ons, install from zip file, click on this and look for superrepo. It will ask for the version of xbmc, Frodo = 12 Gotham =13 helix =14. If your not sure go to system into and in the bottom right corner you will see a name and number of the version of xbmc ( Kodi ) you are using. Now go back and select the version in surperrepo then go to video click here the scroll down to the latest zip and click here. This should load and I've checked it's working to, sometimes you get messages saying not connected but that could be down to the server not your box. Also check YouTube for more info. Hope this helps