Unscrew base from glass jug making sure to keep the rubber seal then place new blade assembly in to the bottom of the glass jug from underneath making sure that the rubber seal goes between the glass and blade assembly. Screw on base of jug and your done
All is good except I did not realise there were different colour options I have been given a white base and my blender is black so it does not look as good but it works fine.
Only tip we have for users of blenders is to be sure to NOT drop the inner lid into the blender whilst blending - the tough blades made minced plastic of the lid and hence the need for a replacement