How to take the back left panel of a 2007 ford focus hatch back to reach the speaker?

I can't seem to find a way to get to the speaker and when music with a hard bass come on it raddles beyond God. I'm thinking it needs a rubber cushion or something to stop the rattling what do you guys think if now and how do I take off the panel?

Model year:2004
Registration year:2009
Condition: Used
Transmission: Automatic
Model name: march
Body type: Hatchback
Fuel type: Octane
Engine capacity:1,000 cc
Mileage:46,000 km
Nissan March 2004 model, registration in 2009, hatch back in black color, 1200cc, octane driven, auto transmission, only 46000 kms genuine millage. Full option with AC, power steering, built CD, back wiper, auto mirrors, alloy wheels, new tires (European tire, named Petlas) , biscuit color interior.
Interior and exterior has no major scratches or damages with 100% accident free.
No driver used. Engine is soundless and maintenance are done up to date.

I do not want to be contacted by telemarketers.