How to add a own subtitle, some of my subs are here but...

[Neeboo]

Can someone put me in the right direction where i can add a subtitle. I'd saw my own subtitle already here but i didnt put those here. For example, the movie Interstellar had my Croatian subtitle but not one of them is the right one, the one i have done for public. All the subs for this movie are not quite good. So where can i add the right one. https://www.dropbox.com/s/1khbja270s...ellar.zip?dl=0http://www.dropbox.com/s/1khbja270s3...ellar.zip?dl=0.