You may have to physically put them in for a few nights, but then they will get the hang of it and go in on their own. We have a light in ours that comes on for about 20 minutes and that gives them time to get in and get up on the roost before it goes out. Allows enough time for pecking order arrangements, too. LOL
The white chicken is an easter egger! She is entirely pure white with grey legs. She's the same age as the rest of them but has always been the biggest, We've nicknamed her Big Bird until we can tell the wynadottes apart.