How do I change my resolution while in game?

How to I get to the in-game settings? Can I change from imperial to metric? What do the Low, Medium, and High quality settings mean? How do I resize my window? What do all these advanced graphics settings do? Does the game have in-game sounds? How do I use the in-game audio? How do I get into or change audio channels? How do I switch between audio channels? What are group audio channels? and 3 more ...