Use caution while doing this.
You can hurt yourself or the printer.
Raise the Z axis to about 150mm
unplug the printer from the wall
Remove the 2 screws in the picture below (red arrows)
Make sure the wires are secure and let the hot end hang.
Plug the printer in and heat the hotend to 190c.
Either handle the hotend by the isolator guide (blue circle)
or use pliers.
If the filament is poking out the back end after it heats push it in a little then pull it out.
If not use another piece to push it through.
Do not burn yourself (it hurts and is easy to do, Don’t ask how I know LOL)
