How to ask off of work for a funeral

I know this is stupid but I don’t know how to ask for Thursday off. I work just a four hour shift that day. But I would like off to go to a funeral. It isn’t for an immediate family member, though. Do I ask for off or tell them I have to go to a funeral? Should I ask to work those hours the day before instead? I have off that day. I have worked there for two years and I have never called out or anything like that. And my manager does like me. I just have anxiety about things like this. I don’t want to ruin anything for anyone or make us be behind on work because I am not going in.