'Gas Pedal'
next we'll be discussing and fenders and hood's!!
Sorry Sunday morning humour! It's raining and the GP coverage don't start for at least another 15 minutes.
If you can't prise it off try un-screwing it, the metal pin into the floor is to provide space for the underlay to sit between the carpet and the floor hence allowing the plastic retaining clip to sit in a slightly elavated position. Its normally just pushed on to a ribbed(for your pleasure) pin that vaguely acts as a self tapper from the floor/bulkhead panel.
Anyway back to then tail lights and license plate's