Hello! so to replace the bowden tube and nozzle, you want to heat up the ***nozzle to around 170C***. then use the small wrench in your creality kit to unscrew the nozzle (youll need to ***unscrew it clockwise i think***)
to remove the bowden tube, you'll need to
first remove the blue clips from the tube (from the extruder side and the hotend side)
push down in the white plastic nut/part till you hear a soft click
pull the tube you
another way is to use the large wrench to unscrew the big nut on either side of the tube