fuse block

Does anyone know what bulb goes in the fuse panel? Also can anyone explain how it is supposed to work? I don't think that metal tab should be folded over like that.

Last week, all fourteen terminals of my fuse box had continuity. Then, I managed to blow a fuse while searching for a directional signal failure. I replaced the fuse but now only terminals 1-8 have continuity, 9-14 do not (the fuses are ok). Looking at the back of the fuse block is...