How do I connect my Twitch account so my streams show on VERGR?

Open Settings, then Connected Accounts, and connect Twitch. From then on, when you go live on Twitch your stream shows on Vergr, with chat synced.

It also works the other way: when you stream to Vergr from OBS, turn on Stream to both on the Go Live screen and Vergr sends it to your Twitch channel too.