How to disable rus audio & add eng audio:
Link for the guide-->
mkvmerge instructions for english audio only
2. drag completed download to input files at the top
3. click once on each "track"
4. remove any unneeded subtitles or audio tracks by clicking again and unchecking the box.
5. in the last box "output file" click on browse. find a folder to put all your movies into. I use a folder i created called "ready to burn"
6. click start
7. if you have a bunch of movies and want to convert them all at once, put them in the queue instead of clicking start. name your "job"
8. at the top menu bar click on muxing.
9. go down the menu until it you reach manage jobs. click here
10. select your "job" from the list.