Load filament

Heat the extruder, through the menu > prepare > preheat PLA / ABS.

Removal: Once it reaches the proper temperature, manually extrude some material and then, pushing the filament driver lever down, pull the filament out from the extruder.

Replacement: With the extruder hot, insert the new filament, and manually rotate the black knob counterclockwise until the material is extruded.