Here's the translation:

Remove the hopper lid.
Rotate the hopper switch to the "off" position.
Turn the hopper counterclockwise to remove it.
Lift the grinding disc's pull ring.
Rotate the grinding disc counterclockwise and pull it out.
Clean the blade with a mini vacuum cleaner or brush. Avoid washing with water.
After cleaning, reassemble the parts in reverse order of the above steps.

Specific operations please check the video:
https://www.youtube.com/watch?v=MWP15ywPZN4