How do we switch subs to english? The are chinese by default and I can't find option to switch.

I have encoded this with changing vtt to srt subs also changed opus sound and more it is now playable on any tv, how do I upload this ?

Thank you for your reply I did try to upload, but was unsuccessful.
I will not try again all programs I used are free of use, and I have used them for a long time, except for the .vtt to .srt subs, but I still found one, sadly it remains for personal use as I doubt I am allowed to give you the names of those programs on this site still I am willing to take a risk (Elgindy VTT.to.SRT.Converter) is what I used, it must be said that all vtt subs had all the same numbers, so I needed to alter that and so much more, also so much work, and the end result is subtitles over Chinese subs both white so at certain times unreadable. At least I can watch this series on my old led tv, so my effort is not for nothing, I have been doing this for many years, just because I don't like to see anime or donghua on a monitor. TY.