Tutorial: Make Chapters in MKV using MKVToolNix

Alright, we'll just go right to the point.. Let's say that I'm watching a concert movie, but hell, I can't seek through the song via chapter.. Now I must click and click through the seekbar to find the song (which is really not handy at all)..

So then I decide to make the chapters myself.. How?? Well then, here is step by step on how to make the chapters using MKVToolNix..

Tutorial: Changing Internal Subtitle Language (if Available) in MPC

Okay.. Maybe you ever experienced this before.. You download a movie said to be English sub but contain different sub language.. But wait, don't get upset quickly.. There is some chance that the movie contain more than 1 subtitle in it.. So, here is the way to check and changing the available internal sub:

For example, I want to change the above subs to English.. What should I do?