How to use 3p (third party) chatting on showdown

Optional but recommended to protect your main PS (Pokemon showdown) account¹: Change your IP (by resetting router etc)
1) Go to a play.dogars.ga link. Refresh the page if the client doesn't load
2) Click on "Choose name"
3) Register a new account/Use a disposable account¹
4) Click the options cog on the top right corner
5) Tick the box next to "Send chat messages through alternative channel"

You can now send messages to other users on play.dogars.ga. Messages can be sent to the normal PS server by holding down the Ctrl while pressing Enter
¹ - While the mods haven't locked anyone for accessing PS through play.dogars.ga yet, this may change in the future

Extras:
Image uploads in 3p chat: https://pastebin.com/X4XmSWey