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Each user has a verification code specific to them that they can use to link streaming software (e.g., OBS) to a YouTube live stream. To retrieve your key, do the following:  Go to https://www.youtube.com/live_dashboard_splash in your computer's web browser, then log in if prompted. Click the Stream now tab on the left side of the page. Scroll down to the "ENCODER SETUP" heading. Click Reveal to the right of the "Stream name/key" text field. Copy the stream key by clicking it and then pressing Ctrl+C (Windows) or ⌘ Command+C (Mac). Open Broadcast Software Studio is a free program that you can use to broadcast your computer's on-screen content through numerous streaming services, YouTube included. To install it, do the following:  Go to https://obsproject.com/download in your computer's web browser. Select your operating system if the website doesn't automatically determine it. Scroll down and click Download Installer. Double-click the downloaded setup file. Follow the on-screen installation instructions. Click or double-click the OBS Studio app icon, which resembles a white fan on a black background, to do so. On a Mac, you may first have to open the Applications folder to find OBS Studio. This option is in the upper-left side of the window. A drop-down menu will appear. On a Mac, click OBS Studio in the upper-left corner of the screen. It's in the File drop-down menu. Doing so opens the Settings window. On a Mac, click Preferences... in the drop-down menu. You'll find this on the left side of the window. Click the "Service" drop-down box, then click YouTube / YouTube Gaming in the resulting drop-down menu. Click the "Stream key" text box, then paste in your stream key by pressing Ctrl+V (Windows) or ⌘ Command+V (Mac). Both options are at the bottom of the window. If you don't see Apply and OK on a Mac, just close the Preferences window. If you're playing a game or streaming a movie, open and set up the media in question. It's a button in the lower-right side of the OBS Studio window. Your stream will begin. You can check that your stream is live by going to https://www.youtube.com/live_dashboard_splash and looking at the video in the middle of the Stream now section. Click the Stop Streaming button in the bottom-right corner of the OBS Studio window. Your streamed content will be saved to your YouTube channel as a video.

Summary:
Retrieve your YouTube stream key. Install OBS Studio. Open OBS Studio. Click File. Click Settings. Click the Stream tab. Select YouTube as your service. Enter your stream key. Click Apply, then click OK. Start whatever content you want to stream. Click Start Streaming. End the stream when necessary.