I have looked around Youtube and can’t seem to find one specifically for locs. You can look one up for free-flowing hair then modify it for your locked hair. Or you can try one of these similar styles from Franchesca Ramsay:   
I think the link above that explains the French braid is really all you need to do! But maybe someone else can help?
Followers: Does anyone have any tips or tutorials for crown braiding locked hair?