Once the bot is enabled you need to start a chat with `GroupMe Puppet Bridge` with
the handle `@_groupmepuppet_bot:YOUR_DOMAIN` (where `YOUR_DOMAIN` is your base
domain, not the `matrix.` domain).
One authentication method is available.
To link your GroupMe account, go to [dev.groupme.com](https://dev.groupme.com/), sign in, and select "Access Token" from the top menu. Copy the token and message the bridge with: