You are a streamer

1. Download & install ChatGuessr
2. Open the settings

   (ctrl+p)

3. Go to Twitch connect
4. Fill in your Twitch channel name
5. Fill in your bot account (optional)
   Using a secondary bot account to handle the whispers is recommended. However, if you don't have one, just fill in your channel name again.
6. Get your oAuth token here
   Make sure you are authenticated with the account you plan to use as the bot when you generate the token.
7. Click Save
...The bot should now be talking in your chat. Your chatguessr link will be generated. (e.g.: chatguessr.com/map/<yourBot>)

You are a viewer

All you need is a verified Twitch account, no geoguessr account required.

1. Get the map link from the streamer (usually !cg)
2. Make your guess on the map
   The command is automatically copied to your clipboard
3. Paste

   (ctrl+v)

   the whole command in chat
   e.g. /w streamer !g 3.172037, 113.041666
...Your guess will be displayed on the scoreboard