I am so stupid bur where can i save my video with subtitles? Please help and send me insruction or screenshot if you can. Thanks!
both with the same main name, preferably.
You can then use a good video player like VLC (multiplatform, downloadable from http://www.videolan.org/vlc/index.html) where you can enable or disable the subtitles. Tutorial: How to add subtitles in VLC Media Player.
2. More complicated: burning the subtitles into the video
You'll have to download the subtitles and the video as in 1. Then you can use a good video editing software that supports burning downloaded subtitles to burn them into the video. Maybe the one already on your computer does that?