Now that you have everything set up -- you have your hardware together, your stream is ready, and you've checked your audio levels -- you're probably itching to go live and start getting some real followers. Here's how to do that.
Step 1: Connect OBS to your Twitch account
Log in to Twitch. Open your Dashboard and click Stream Key.
Click Show Key. You will see a warning telling you that you should never share your stream key with anyone or show it on stream. Click I Understand to proceed.
You will see your Stream Key. Copy it and open Open Broadcaster Software. Go to Settings > Broadcast Settings and paste your Stream Key into Play Path/Stream Key (if any). Under FMS URL, choose the server that's closest to you. Click OK.
Step 2: Action!
Once OBS is connected to your Twitch account, click Start Streaming to go live.
To title your broadcast and preview your stream, open Twitch, go to your Dashboard and click the Live tab.