To cause Subtitle to pop-up, in replacement of audio for any video files

In video files, for no subtitle, there is only audio, so how to make subtitle appears?? When I download, the most basic download video files is one file, not two which it would include .srt. It is not there, so since for the most basic download video files (any format), the subtitle is not at subtitle base since it is movie, not tv show and the tv show is this month (September). I download a tv show for this month when it is new, so it is recently new to internet for American and tv series, I assume. So, how to make subtitle appears?? What is the easiest and free programs to use it?? Combine or one program. After you tell me the programs, so can use any video convertor so it can fit to that program for combine subtitle and video. But first to make subtitle appears, without download, no visual .srt as it is most basic download files that is only one file. Can't create myself since I am not hearing. So, hearing people and deaf people can enjoy on the same scale for the first time. Which deaf would have to make it work to cause subtitle to appears. Not waiting for subtitle to appear in internet to download. Since there is more video files, than subtitles, in subtitle data base and .srt files where people can download. I would want to not download, but cause to appears. An audio that becomes to look at.