Help. Need to quit my job today.

Emily
So I've been not liking work lately and been dealing with some more depression. I'm supposed to work tomorrow, but I feel like I'm just mentally done working at that place. How do I just up and quit?
Edit: it's not just the fact that I don't like my job. The owner does not know how to properly train the new people or do management things properly. Work is just so frustrating. Everyone does things their own way. My way should be right since I've been there the longest and was properly trained in by the previous owner that decided to leave.