How do i change a world name?

Hi does anyone know how i can change the name of the worlds?

Quote from Roman

It's in general recommended to keep the default world name if there is no technical need to change it

Yeah, I just made a world download, deleted it, made a new one and uploaded it, now im having trouble uploading a map to a world that was made with the multiverse plugin. How Should I upload a map to a world made with Multiverse?
thanks

-Sword

Quote from Roman

You can just upload it on the worlds page?

I do that and the Server tends to crash on startup. . .I think I got it Figured out, Thanks!