To reset your account password, you'll need to talk to someone that has access to the bot's files or administration areas.
The owner of the bot had the following to say about password resets..
The bot administrator didn't fill this section out.
Please ask them to add or fill out the "reset_message" option in their
config/plugins/web.yml file.
If this isn't enough information to reset your password, please attempt to contact the bot owner or administrators via some other means.