passenger side door no power

[the missing link]

My cab lights will go on and off while I am hitting bumbs so I pulled the fuse . A buddy told me to check the wiring between the cab/ door .also the ground on the switches . I finally got time tonight to look at it and I pulled the door panel off or tried . I pulled the plastic off And there is a aluminum plate , so how the heck do you pull that plate off so you take a good look at the wires , thanks

2008 /. 9900