Correct answer is not to tell people to search and then give a stupid link to a useless YouTube video. To do this:
- Remove the top panel
- Remove the right side panel (from front)
- Pull away the back panel far enough to open a gap between the drum and door.
- Slip the new belt over the drum, push the drum back over the door and retighten the back panel.
- Push the motor to create some slack and wind the belt under the motor spindle and over the black runner.
- Gently let the motor go and it should all tighten up around the drum.
Put the side and top panels back on and done!
Someone with a useful answer, March 2019