Users can reset their password through the terminal of the Plane application. You need to login to backend docker container and run the below command for resetting a user's password.
Get the container id for
Log in to the container
docker exec -it <container_id> /bin/sh
Run the reset password command
python manage.py reset_password <email>
The email should be of an already existing user on the Plane application. If the email is not attached to any user the command will throw an error.