To Get Lockdown Browser on your Chromebook, access one of your classes that you need to take a test or quiz in.
There should be an option for you to download Lockdown browser. Click on Download Lockdown Browser.
Another web page will pull up called the Chrome Web Store. This is where you will get Lockdown Browser.
You will click Add to Chrome, and there will be a pop-up asking if you want to add the extension for Lockdown Browser, Click on Add Extension.
Once you add the extension, it will pull up with another page saying "Lockdown Browser for Chromebook has been installed."
You have just added Lockdown Browser to your Chromebook. Now go back to Canvas and locate your quiz or test.