You should probably a) get it fixed professionally if the cost isn't too dear or b) buy a new one if this one wasn't very expensive. You could try and glue and clamp it over night if the pieces fit back together well, but it appears the headstock overlaps the lower neck rather than the other way around, which is the opposite of what I've been taught to make a strong scarf joint uke neck (which is essentially what you'd be doing if you chose to glue and clamp it, at least as far as I can tell from the photo you posted). Perhaps some more experienced luthiers can chime in as to whether that's a bad idea or not. Try posting some better photos (photo tip, wait for daylight, and take it outside, put the light source behind you/over your shoulder--the trick to get rid of the blur is to get better light).