Missing connector pin for my alb relay for my 1997 el ford falcon

[Luka]

The relay box in the engine bay is missing the alb relay. When I looked at it closer I noticed that one of the pins is missing. I was wondering if this relay box is something I can replace myself (like does it plug in?) or would I have to pay an auto electrician to do it? I attached some photos of what it looks like. Thanks