Here are written instructions i gave someone else mate if that's better:
Go to your settings and click file manager, click on add source. A box will appear with two blank sections, click the top one then type the following:
http://bluemoonwizard.site88.net
After that, type in the second box wizard. Once that's done go back to your home menu of Kodi, click on settings, click on addons, click install from zip file. Click on wizard and then click bluemoonwizard. This will take a couple of minutes too install. Once you've done that, go back to your main menu in Kodi, and go into your video addons, the bluemoonwizard should be there. Click on it and it should start installing, this may take a few minutes, wait until it's installed. Then it will tell you to force close Kodi, chances are again that you'll have to reboot the box by pulling the cord and putting it back in, wait for your device to boot, launch Kodi and you're done!
Sounds complicated but it's relatively easy :)