Electrical Clips for Corner Lights

Anyone know how to detact the metal clips from the plastic housing (located on the plastic inside the red rubber), so they can be moved from the corner lights to the turn signal. They seem similar to the ones found in the fuse box but it could not figure out how to get them out.

 

What is this tang you speak of? The rubber stopper holding the wire in there? And to get the connector to release from the housing does something small need to be pressed inside it and on which side, the side of the white rectangle or inside the connector? Thanks man.