Make sure you're logged in to Twitch. Pull down the user menu on the top-right of the home page:
Click on "Dashboard:"
Within the Live Dashboard, navigate to the "Channel" tab, found under "Settings" in the left-side panel:
At the top of "Stream Preferences," click on "Stream Key."
Click "Show Key" & "I Understand."
Your Stream Key will reveal; copy the text.
Navigate to Socialive, and select the Twitch streaming destination icon above the playlist:
Name your broadcast, then paste the Stream Key into the corresponding field:
Toggle the output switch "ON," and you're ready to stream to Twitch!