¶ 1. Set the hotend temperature based on the filament you are using.
A temperature of 220+ C is great.
¶ 2. Wait for the hotend to reach the set temperature
¶ 3. Attach the spool to the back spool holder and cut the filament to a 90-degree angle
¶ 4. Insert the filament into the back PTFE tube until it reaches the extruder
¶ 5. Touch the extrude arrow on the touchscreen a few times, to pull the filament from the spool. You might need to push the filament a bit from the back, until the extruder gears starts pulling it.
¶ 6. Repeat the extrude process until the old filament is purged out, and the new filament color is clear.