plantations shutter

[Zo]

Hi experts 

I’ve attached photos of plantation shutter. It seems like one of the screw or a nail or something is missing on the right corner attached to the frame. Because of the missing screw, the shutter is detached from the right side and doesn’t move at the same time with others in the frame. 
would you know what part exactly is missing and where can I buy it - how should I fix it ?

thanks 

Zo