Lexus LS 400 Brake Light

Light Bulb Is Out But I Don't Know How To Remove The Cover From The Trunk To Access The Light.

I Have A Message "tail Light Out". It Is The High Mounted Stoplight Just Inside The Rear Window.the Owner's Manual Gives Me The Bulb # 921...

Turns Back On But Check Engine Light On And The Car Will Only Stay On With Acceleration And Shifting Manually From Lowest Gear All The Way...

Notice The Right Brake Light Does Not Work, When I Move The Light Bulb Around It Turns On But My Sensor Is Still On, Displayed At The Dash...