1st. It might be stupid but how do i change my diff. oil i know how to drain it and i know where the fill bolt is but it is sideways isnt it or am i looking at the wrong thing

2nd. My quad has been getting really hot lately and im not sure if something is clogged of its just me

 

In response to your heat problem the first thing I would do is check and make sure the oil cooler is clean of debris. Getting mud in the cooling fins can make it heat up rather quickly.