What are you confused about, perhaps we can help? Do you mean you have one and don't know how to use it or you want to buy one?
If you are new to mixers it may be quicker than if you are an old analogue users. In essence - they work very logically. You need to get your head around the concept of routing. With the latest firmware, virtually any input can be routed to any output, in whatever order you want, and the select buttons are the key - you press one button then everything - sends, fx, returns and eq then relates to that channel. When you are done - you move to the next. Most features can be accessed multiple ways. You can turn a real knob, use the screen or use a phone or tablet to do the same things. When you get something good, you save the settings.
Feel free to ask specifics - I'm sold on them, and have multiples in stock.