Nicolas Connault said this video should have more emphasis on the relationship between administrator and teacher settings which I tried my best to show here. I did not explain too much about what each setting does as it would have taken too much time but the use of letters is pretty common sense.
There are lots of different settings "gradebook site settings", "gradebook category settings", "gradebook item settings", etc. which were not included in this video because it would have taken too long and I felt "gradebook category settings" and "letters" settings were the most useful in showing how admin actions affect the teacher. Even just showing two examples made my video more than 4 minutes long (I hope that is ok, the limit was supposed to be 3 minutes).
Please review the video and get back to me with any comments or suggestions. Thank you for your time!