hello can you please help me , when i click shift+u and use start point, its only for one person, how can i make it for more than one?? like normal start point in race
I don't think that's what he meant. He means that the startpoint only applies to one person and he wants it to apply to everyone like a normal start/finish line would.
If you want everyone to start the race at once, you need to NOT set a start point and leave the default starting point there. I think that's what you're looking for...