Get the PRND2 Plate loose, twist it afterwards, undo the nut at the bottom of the shaft of the shifter, then unscrew it and pop it out.
Thats what I had to do on my 300CE..
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.