I would suggest that you corner a senior student before or after class. They can show you in person what we can only talk about.. If that doesn't work, than try a different senior student next class.
I personally have found that there are some people who can explain things in a way I can easily understand, and that there are some people who cannot. This doesn't seem to be correlated to rank, or to whether or not the person is an instructor.
At least with rolls you are presumably fortunate enough to have a significant number of people you can ask to help you..