¶ 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.
We also have video guides on how to load the filament to your printer: