unclip all the white clips under the trunk ( just push them up)
push up and pull the cover slightly
use a 8mm socket to remove the speaker.
nut removed, simply just push to the left to unhook the speaker. (do the same on the other side but push it to the right)
unplug the connector.
remove the speaker.
sub.
remove 4 nust on the sub (8mm socket)
take the sub out and unplugg the connector
remove the sub.
reverse the work for installation. or follow the instraction on the aftermarket sub/speaker installation. (sometimes, use common sense)
to put the cover back. make sure all white clips are on its place (like on the pic below.)
enjoy.