how do you add subs to a movie when the subs are seperate?
Mate just use VLC media player, it adds the subs automatically if it doesnt then this is what you do: and if you dont have vlc then this is the link
download and install from there.
if the subs doesnt add automatically then do this
go in the top left corner and click on media and then click on "Advance Open File" or just press ctrl+shift+o then choose the video file you want to play and the subs.
It should be done, and if you still dont understand then just pm or reply i ll post pictures.