how to tighten front signal housing

[landarcht]

My driver side corner signal light housing (next to headlight) for some reason became loose but I can't find any location to tighten it, I looked at the back but can't locate any attachment points, any advice would be greatly appreciated.

 

[Bisho]

The housing has a locking tab on the headlight side near the bottom, and a tab on top that screws into the fender.